I tried the 28f2.8 Asph and found that it was not that great on film M's. I know people who uses it with the RD1 and the M8 and are happy with it. On the "full frame" ie film the corners are soft at f2.8. It is by no means a bad lens, but there are better choices out there.
Thanks so much Tom - you are a fountain of information! BTW, what do you think of the pre-ASPH Elmarit 28? By lucky chance, one has just come up for sale second-hand down here.
Cheers,
Jonathan.
I still have my 1981 Elmarit 28f2.8 and it remains a favourite of mine. the newer offerings from Leica/Zeiss/Voigtlander are most likely better in some aspects, but this Elmarit was my "middle of the road" wide angle when we lived in Paris 82/83. Somehow there is a bit of sentimentality attached to it. Wide open it is a bit soft in the edges, but in black/white it works fine. The version that followed this (with the flat front element) is still a formidable lens - even by todays standard. However in that pursuit of "speed" -the f2's are the flavor of the day. I have to admit that my Ultron 28f2.0 goes along with me daily - could also be the size and the fact that on the R4M it does not block the viewfinder as much as the Elmarits or the Summicron 28.
I dont use digital and I suspect that many of the lenses we discuss behave differently on these beasts than on old M2's with Tri X. Truth be told, I wont go digital until my 28/35 or whatever is that on the Drf. If I put a 35 on a camera, that is what I want it to show, not some 42.5mm or 49mm focal length. Seems like it will take a while before this cames to bear and in the meantime there is about a mile and a half of film in the freezer!