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The 100 f/2 is a very highly regarded lens. It has a lot in common with the Oly 90 f/2 Macro. They were made about the same time, both have ED glass, both have floating element construction, and both have a fairly short minimum focus distance (the 100 focus to .7M not making it a macro but a very respectable about 1:4 magnification). It does cost a fair bit, however.
If you are looking for an inexpensive lens in this range. An excellent option is the Nikon 105mm f/2.5. It is a little slower, has a longer minimum focus distance, and doesn't have ED glass, but it does have excellent bokeh and is a wonderful portrait lens wide open and is quite sharp stopped down. Best of all you can get one for less than $200 typical. I prefer the Ai to the AiS mainly because the AiS has a crappy built in hood that is an annoyance.
For a little more money you can get the Contax/Yashica mount Zeiss 100mm f/2 that is very sharp and has an even better reputation than the Oly. It is know for it bokeh as well as its high resolution. It doesn't have the floating element or the short minimum focus distance, or the ED glass, but many people would prefer it over the Oly. The modern ZE/ZF 100 f/2 macro has some similarities to the C/Y Zeiss 100 f/2 and would give you even closer MFD, a floating element, and excellent sharpness.
At 28mm I would recommend the Minolta MD 28mm f/2. It is a quite good performer and reasonably priced. It is of course a full stop faster than the Oly and IMO has a lot better bokeh than the Oly 28 f/2. The Oly 28 f/2.8 is about as cheap as they come, so the Minolta is more expensive but it isn't too bad at $350 or so. Another very good bargain 28 is the Pentax K mount 28mm f/3.5. It seems to have better contrast than the Oly 28 f/2.8 or Oly 28 f/3.5 and is equally sharp across the frame.
Good luck with your search.
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