Hey thanks guys, this is great input and very helpful.
Steve, the R Summicron seems to sell at "reasonable" prices, starting ~£300 (Looking at eBay history) I could manage that ;o) Pity it's heavier though....and needing a longer adapter than the M..
The M (pre AA Ver. III) seems to start a lot higher, ~ £500, That's where I usually stop.
I wonder why the difference?
[EDIT. Possibly I'm not comparing like for like, some discrepancy on sites as to which Ser numbers are for the latest pre AA version, the above prices all seem to be for R, Ser # starting 30... and 31..., but on Thorsten Overgaard's compendium he says they start at 3381677 and the above are the earlier '70-'77 ver. In which case the R version is possibly more expensive than the M !?]
Piere, I really like the look of the Summicron R there. Have you any more from the OM90 wide open, it seems a less sharp transition from sharp to unsharp, which isn't as sebboh described it, but that may just be the distance away of the sharp focussed trunk. Also the colour is more muted, or is that the processing? From just those examples, I don't see any advantage over the OM 100/2, perhaps there isn't any? (except for close up of course)
uhoh, price wise I don't like venturing above £500,( and most of my lenses tend to be under half that), though I did go a lot higher for the ZE MP 100/2, so for something REALLY special I would. For instance, IF the APO Summicron were ~ £800, sadly it's usually nearly twice that.
I think you're probably right about the "fast" and the "slower" though, (except perhaps for the MP 100/2 and the Apo Summicron), it seems that the ones with best bokeh aren't "that" sharp, and vice versa.
From what I've seen, I far prefer the softer bokeh of the Summicron to the Elmarit, though I expect the Elmarit might be the sharper of the two, stopped down. The Hex I hadn't considered, but I'll look into it. Any more from it wide open outside?