Ultron 28 1.9 ASPH. Smaller than previously owned 28 2.8 III Elmarit-M. Less expensive as well.
It is not as good as Elmarit-M on darkroom prints, but not flat.
On digital M it is smooth lens. Some are saying it is as good as Summicron 35 f2 ASPH.
Most of my "Hamilton as i know it" color shots were taking with this lens.
Ultron 35 1.7 LTM. This lens was better lens than CS 35 2.5 on prints.
No harsh contrast and it was not flat rending lens at all.
They say VM version of this lens is better comparing to Leica and Zeiss.
I think, it is possible to add focus tab to LTM version. With this it is best 35 RF lens for price and performance. For darkroom prints. IMO.
Nokton 50 1.5 VM. Great lens on prints and on BW digital. More alive lens comparing to sterile Planar ZM, Cron Rigid and IV in BW.
Summarit-M 35 2.5 ASPH - best lens I ever owned and have negatives to print from.
Even better than 35 1.7 Ultron LTM I owned before it. It is not about distortion free and such, which this lens isn't great, but very pleasing rendering of small details, edges and contrast on darkroom prints. It simply gives more on the print, but nothing too sharp.
I'm not using it much on digital M, camera I not using much in general. But it is very good, nothing retro or clinical.