>>327147121 is very wide and maybe not for everyone, I quite like it though. I don't find to much trouble with putting a finder on my M3, I don't see why a CLE would be much different.
28 never feels wide enough to me
I just picked up a 15mm voigtlander and I am wondering if it's too wide.
try it out, see how you feel about it. If you are buying and selling used, you seldom lose money on Leica gear (including Zeiss Voigtlander, and Minolta).