The 20/f4 is a macro only lens, i.e. for use with bellows. For normal use there is the 21/f3.5 and 21/f2. The former goes for a pretty good price, it is quite prized by many OM enthusiasts. The 21/2 is even more expensive and, I can say, is stellar. I have one and it is not going anywhere soon.
Unless you are doing very low light stuff and need the 35/2, I'd save my money and go for the 35/2.8. Yes, the 35/2 is wonderful, but a LOT more expensive than the 2.8. And the 2.8 is no slouch, not by a mile.
Of the 28s, I can't say which is "better". I have both, but haven't done exacting comparisons. I snagged a 2.8 for very little money; there was a delay in shipping and the seller was quite apologetic so refunded my shipping. So I think it ended up costing me about $10. (There is some very slight problem around the outer edge of the front element, but has no effect on images.)
I echo the comments on the 50s ... my 1.4 is not in 1.1M serial number territory, butis quite nice. I also have a late 1.8 (miJ), as well as an MC 1.8. Only the first edition (silver nose) was sub-par, but even that had a very nice look to it if sharpness was not a real issue.
Another really, really nice lens is the 100/2.8. No, a short tele is not often thought of as a 'street' lens, but sometimes it comes in handy. And for the money, the Zuiko 100/2.8 is quite, quite nice. It is nearly as small as some other brand 50s, so I think the small size/handhold-ability add to its usefulness.
All reports I've seen on the 40 (as much as I'd like to have one for its size) indicate it is not worth the premium it is now fetching. Not that it's a
bad lens, but at $600+, it's too much.
BTW, I don't think 28 is too wide for street work, and I think 28 and 35 are enough different in look & feel to have both. They're small.
Earl
PS: Hey Andrew ... good to see you here! I'm mostly on RFF these days; shooting mostly with and Olympus 35 SP, which seems to be welded to my hands.
Jeffrey A. Steinberg said:
Go a little wider. The 24 F2.8 is an amazing lens. 28 never felt wide enough for me. They also have a 20 F4 but I nevery tried that.
For me the ideal set is:
24 F2.8
80 F2
100 F2.8 (I believe)
134 F2.8
With that you can own the world. Great cameras, very light and nice. Make sure you get the camera cleaned and algined and get the foam replaced at a reputable repair shop.
Congrats from a 30-year user of an OM-1n who just also bought an OM-3 and an OM-4Ti
--Jeffrey Steinberg