Vocal Range and Profile: Liam Payne (One Direction)

Vocal Range: C#2 - C5 - Bb5 (B5)
Vocal Type: Lyric Baritone (3 octaves, 4 notes and a semi-tone)
Vocal Rating: A-List

Positives: Robust, clear lower register that is projected well, often being the bass of harmonies in his group. This area is achieved with great technique and support down to F#2. A highlight of the voice.

Slightly brightening as he ascends, the middle register still maintains ease and displays a warm, masculine tone. Though he gains a slight (pushed) rasp above E4, his voice remains open, projecting well. Unlike the rest of One Direction, Payne has a well-developed mixed voice, allowing him to access a clean, head-dominant C5 belt. 

A light, warm falsetto that Payne has no issues staying in for extended periods. This area possesses a soft vibrato and is reached with ease until around Eb5 when Payne needs more volume to phonate.

Solid understanding of musical phrasing, being considerate to the music by changing vocal colors, texture, and dynamics.

Negatives: The upper extremes of the falsetto are unstable and undeveloped, and the chest register thins considerably as he ascends. Though he mixes at the extremes of his chest voice, the rest of the belting range could use a more even mix.

C#2 - G4 (C#5) - G5

Vocal Range and Profile: Jessie J

Vocal Range: C#3 - Bb5 - C6 (Eb7)
Vocal Rating: A-List

Positives: A very fluid voice with an underestimated rock edge. Great fluidity, capable of singing incredibly long and complicated melismas with ease. She is able to utilize this ornament in all areas of her voice. She has explored the whistle register with exclamations, occasionally glissing into the 7th octave.

The lower register while the weakest part of the range, can have a slow vibrato applied to it. The mid-range gains healthy resonance, and it where the voice sounds its healthiest, accompanied by Jessie's lightning fast diction and rhythm. The upper chest voice maintains this piercing quality, though it noticeably thins above E5 and Jessie slides into a mixed voice.

Negatives: Notes above E5 can become shrill and thin, and are often squeezed, making them unpleasant to the ear while low notes (below F3) lack resonance and are breathy. Jessie also lacks restraint, struggling not to rely on melismas to impress. Her vibrato and its speed can also be polarizing (often being too fast).

Her 7th octave glissandos aren't being counted because they're not being sung in a key, and there's no accuracy or pitch control for those notes.

Vocal Range and Profile: Zayn Malik (Formerly of One Direction)

Vocal Range: G2 - Eb5 - A5

Vocal Type: Lyric Tenor (3 octaves)

Vocal Rating: A-List

Positives: A voice that has distinctive tone and texture that can separate him from his (former) band members. A smokey texture is present throughout the voice, especially in the middle register. Good phrasing shows greater knowledge of musical ideas and phrase's context within songs. Able to execute melisma quickly, demonstrating control of his passagio. Good dynamic diversity as well.

His lower register though easily the weakest part of his range, is well supported, sounding dark and healthy down to Bb2. His mid-register gains a smokier texture as he ascends, brightening significantly, and showing off his vocal colors more so than other areas. His upper chest voice has been developing a more even mix, showing openness up to B4. Malik can stay in the Tenor tessitura consistently, showing off his incredible ease (Pillowtalk).

A beautiful falsetto with the ability to seamlessly transition from chest to head voice (see You and I). A light vibrato can be heard in this register as well. Malik can project in this register excellently without strain (BeFour and She). 

Negatives: Upper chest notes can sound tense as his mixed voice hasn't fully developed yet, struggling more with closed syllables. His throat and jaw have shown extreme tension while singing. Most notes lack vibrato, or the vibrato is very subtle. His diction has also been unpolished and awkward. Melismas may not be clear.

A2-Eb5-A5

G2 - C5 - G#5

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Vocal Range and Profile: Kiesza

Vocal Range: E3 - A5 - F#6
Vocal Rating: B-List
Vocal Type: Light Lyric Soprano (3 Octaves)
Recommended Listenings: No Enemiesz, Hideaway

Positives: Great connection between all ranges of the voice, creating great ease throughout ever register. A great mixed voice allows her to reach up to G#5 without any hints of strain, while the head voice is flawlessly connected to her chest voice and can ascend to F#6 without issue. The head voice is light and feminine. The lower register though under utilized and not extensive, does not seem to illustrate any technical issues. Solid breath control allows to her to perform dance routines and still hit G5's and G#5's without the pitch suffering (see Hideaway and No Enemiesz live). Good dynamic control (What is Love)

Negatives: A strange twang to her voice becomes apparent in some chest notes which can sound like tension, and vibrato isn't utilized very often.

G3 - G#5 - F#6
An E3 can be found in her performance of Take Me To Church in Berlin.

Vocal Range and Profile: Sia

Vocal Range: Bb2 - F#5 - C6 [Bb6]
Vocal Type: Light-Lyric Soprano [3 Octaves and 1 note]
Vocal Rating: A-List

Positives: Instantly identifiable voice, with a fast vibrato and original rasp contributing to this. Able to sing complex melisma with great agility (see the head voice riff in Elastic Heart). Her low notes are not hit by lowing the larynx and have a dark quality to them, though they are easily the weakest part of her range. The mid-range is strong, as well as chest voice notes up to C5. Her head voice is sweet and feminine. Her phrasing and tone are original and instantly identifiable.

Proficient with legato phrases. Her voice is able to adapt to different genres in the pop field, such as disco, pop/rock and EDM. Able to execute growls without strain.

Negatives: Upper chest voice belts (those past Eb5 usually) are horribly strained and pinched, and are never mixed, leading to cracks. Her voice cracks, though they appeal to some, show signs of vocal damage either due to substance abuse, poor vocal technique, or both. She also utilizes vocal fry very often, though this could also be seen as an emotive positive.

Her vocal range on 1000 Forms of Fear, Bb2-Bb6

Notable mention to oziroxxmisoxx on YouTube for a strong write-up on Sia's voice.