Transparent Audio Gen4 vs Gen5

I have ultra MM2 and a friend brought over REF MM2 last weekend. Now I'm torn between buying gen5 ultra or looking for used Ref MM2.

Did you found Ref better overall or just different?

REF had much better imaging, and smoother on top. No hash at all.

I just demoed speaker cables Ultra mm2 and Super mm2 on ARC / Wilson (ICs were Ultra mm2 source to pre & Super mm2 pre to amp). Same character, but Ultra mm2 is superior in every way. Super mm2 sound more warmer, but adds gloom. Lower in spectrum same thing; more bass, less definition especially weaker attack. Ultra mm2 has better timing, stage and overall ballance. It's not that Super mm2 is bad especially for half price, but Ultra is clear upgrade.

After speakers cables I tested IC Ultra mm2 vs Super mm2. Almost same result; Ultra mm2 is more precise and punchy.
Anybody has experience with Super Gen5?