Well, as a person who also seems to use 35 more often, I have a couple/few 28mm lenses in the cupboard.
Of my 28mm lenses, my v4 elmarit is my hands-down favorite. I nearly got the v3 elmarit, but a v4 came along at better price and I like the smaller size of the v4. But, being Leica lenses, none are "cheap". To me, the v3 elmarit has a look I really like, and its usually priced nicely for a somewhat recent Leica M lens.
Other than the elmarit, I seem to only have LTM 28's. The small, well-made Canon 28/3.5 is really a nice lens. Mine is haze free, but its still quite low contrast. Sharp, but low contrast. None of my other 28's impress me.
But I leave with my actual recommendation: The CV 28/2 Ultron. There are a few folks here on RFF who swear by this lens, and backed it up with some lovely photos. Search for the threads, you'll find them. In terms of bang-for-the-buck, it really seems to be the way to go. And, not being one to recommend a lens I've never tried....I had a day (actually 2 days) with said lens about a year ago. It was mid summer and very contrasty daytime conditions, so my images were really contrasty, but really sharp. I didn't get a chance to take advantage of f/2 during my test, but considering my other f/2 lenses, I know I would appreciate it!
Using a 28 in general. That's something you'll have to see if you like. I like it, but its not my primary "vision" with Leica's. Typically 35 or 50 for me. I also struggle to use 90, but there are times for that focal length too. Least we got choices, eh?
