In a photograph of Tony Banks' home studio, the Yamaha CP-30 Electric Piano can be clearly seen positioned beneath the Polymoog on the left side, as evidenced by an image shared on Reddit.

You can see the keyboard in the second picture in this interview from Complex.

https://www.complex.com/music/2018/12/ludwig-goransson-2018-ultimate-secret-weapon-interview

Played on Sunlight 1978

Gary Numan is credited with Yamaha CP 30 in the liner notes for Telekon.

In this review of Keith Emerson's 1981 album "Honky", Background Magazine notes where the album was recorded and what musical gear Emerson used on it:

"Honky was recorded in the Bahamas and 'honky' is what the local children called Keith while he was there! The pictures inside the booklet show that Emerson's stay there was primarily a holiday, so this album was recorded in a relaxed, carefree spirit. For this record Emerson used the following instruments: Yamaha CP30, MiniMoog, Hammond C3, Korg 3100 & 3300, Steinway concert grand model D, Yamaha grand and a vocoder. [...]

The album certainly contains some fine musical moments which can be enjoyed by lovers of prog rock. Especially the album's opener Hello Sailor is an amazing piece of music. This is a kind of mini-suite divided into three pieces called Introduction, Bach Before The Mast and Hello Sailor Finale. This suite comes closest to what Keith Emerson is famous for with the albums he recorded with ELP. The first part is performed on the piano and tends towards a style that can be heard on albums such as Brain Salad Surgery (1973) and Works, Volume 1 (1977)."

Harry used a Yamaha CP-30 on his "Paraiso" album, according to the liner notes

Greg's original stack of keyboards on the first record consisted of a MiniKorg 700S, a APR Omni MK1, and a Yamaha CP-30 electric piano. The CP-30 is heard on "Bye Bye Love" and "All Mixed Up", just to name two songs. He continued using it up until or after Panorama.

In the music video for private eyes, the CP-30 can be seen in the background below the Prophet 5. It’s most identifiable during the closeup shots of the keys where the knobs above are distinguishable of those on the CP-30. Despite being in the music video, it is unlikely that the CP-30 was used as the main piano sound in private eyes as the CP-30 is incapable of creating realistic piano sounds. It was most likely used in the video because they needed an additional keyboard prop. The sound in the song may have been a different model in Yamaha’s CP line.

The Yamaha CP-30 now satisfies McVie as a replacement for the Pianet. She recorded with it for the first time on Tusk, and approximates the Pianet sound live by engaging the first three stops on both groups of stops and using more bass than treble. Her model was modified to eliminate a loud hum that occurred when the volume pedal was opened all the way, but otherwise she has had no complaints about it.

"It can sound a lot like the Hohner," she says, "and it can sound like a Rhodes, really pretty and clean. It has great variety, a volume pedal, a nice sustain, and a dual pitch control where you can tune it just a little out of phase with itself to get a fatter sound, which I like to do. You can use it for so many things I used to have; where I needed three keyboards in the past, I only need this one now. Besides, I think it would be pretentious of me to have a huge stack of keyboards, since I'm not a brilliant keyboard player. I get by, but I'm by no means a genius, and I don't pretend to be. I don't want to come off like Keith Emerson. So long as I can get the sound I need, I'm happy to just stay with the keyboards I have onstage now."

A 1980 interview reveals that Lyle Mays played a Yamaha CP-30 with Pat Metheny Group. It can be heard clearly on 'Airstream'.

In the YouTube video titled "The Stranglers Live Munich Alabamahalle 14/01/85," Dave Greenfield is seen using the Yamaha CP-30 Electric Piano for piano parts during the performance.

Benny Andersson frequently used the Yamaha CP-30 Electric Piano in both live performances and studio recording sessions, as evidenced by photos on Hiveminer.