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Evening all. I have all prime Hexanon-M lenses and I switch them all back and forth between my several Leica-M's including a CL model and the Hexar RF without any concerns. The 28 in particular is a great lens with tremendous contrast, color definition and very little distorsion. Build quality is outstanding, better than CV and in some cases Leica(my Cron Asph 35 is not as precisely built as the corresponding 35 Hexanon regarding the mechanical assembly). I also have the 75 Color Heliar and comparisons are obviuos as far as build materials are concerned. Regards Fernando