In this Reddit Q&A, the band were asked about the gear they have used and amongst a lengthy list of synths and other gear, they said they used the Korg M1

"Zawinul did not stop at the Wurlitzer and Fender Rhodes electric pianos he used in the 1960s. By the late 1960s he was extending his sonic palette with effects like phase shifters, Echoplexes, wah-wahs and ring modulators, and when synthesizers came on the market he was among the first to buy one (the EMS Putney). The list of synthesizers he has used since then — among them the ARP 2600, Rhodes Chroma, Oberheim Four-voice and Eight-voice, ARP Quadra, Sequential Prophet 5 and Prophet T8, Korg Trident, Oberheim Xpander, Korg VC10 vocoder, Emu Emulator, Casio CZ101, Korg DW8000, DSS1, DSM1 and M1 — reads like a synth museum's treasure list."

"Praise jah I've finally got my greasy paws on an M1."

Teddy Riley uses it on his Dangerous album. Here's his picture on Timbaland's masterclass at 1:26.

From the FAQ page found on The Enigma Archive: "From the credits of various albums, it is known that Michael Cretu uses or has used the Waveframe 1000, Audi Frame Workstation, MIDIMoog, PPG System, Korg M1, C-Lab Notator, Takamine 6 and 12 String, Tom Anderson Electric Guitars, Otari DTR-900, Akai 900, Linn 9000, Prophet 2002, X-Pander, EMS Vocoder, DX-7, and Roland Super Jupiter."

Per this screenshot from a YT Short posted from the artist's own account, Peggy keeps a Korg M1 handy.

using the piano preset for Vogue...

"The rest of the system is quite limited really. There's an S1000, M1 - the Sugar Tax album is the M1. Every single pad, I think is M1. Not just M1, but program 07, 'Symphonic' and program 27 which is one of the choral patches. Those two dominate the album."

In this video, right at 2:11, you can see it in his Delicate Sound Of Thunder rig.

In the video for "September Sun" by Type O Negative, Josh Silver can be seen using a Korg M1 synthesizer.

According to the transcription of credits from the Short N' Sweet (Deluxe) album booklet, Sabrina Carpenter used the Korg M1 on the songs "Please Please Please," "Sharpest Tool," "Please Please Please ft. Dolly Parton," and "Busy Woman," as documented on Discogs.

Equipment & Software used on 'SYNTHWAVES':THORSTEN QUAESCHNING: Software: Steinberg Cubase 8 &8.5Hardware: Manikin Schrittmacher Step-Sequencer x 2Manikin MemotronRoland Jupiter 8 synthesizerRoland JD800 synthesizerDave Smith Prophet 8 synthesizerARP Solina MK2 string synthesizerKorg Wavestation Ex synthesizerWaldorf Microwave synthesizerMoog Voyager monophonic synthesizerModular synthesizerRoland V Synth synthesizerKorg Z1 synthesiserKorg Prophecy synthesiserKorg M1 synthesizerClavia Nordwave synthesizerYamaha TG77 synthesizer moduleRoland System 1 synthesizerRoland JU06 synthesizer moduleKorg MS20 monophonic synthesizerRoland JP08 synthesizer moduleRoland TR-8 Rhythm Performer drum machineOberheim DMX drum machineRoland Promars synthesizerFender Starcaster guitarFender Telecaster guitarFender Stratocaster guitarScrewdriver on wood and contact microphones,Several boxes with contact microphonesA field recording of bees in Thorsten's garden, edited on Cubase and then treated with Melodyne & Halion - and finally used for the lead melody line on 'A Calm But Steady Flow'.(Software synthesizers): Spectrasonics Omnisphere synthesizer, Spectrasonics Keyscape