Visiondr-
Many thanks for the reviews. That gem-like quality & beauty-as-object is what drew me in- that and Mr. Puts review which praised the sharpness. Appears that the bonus is going to be the 'old' look I've been lusting after. My hope is that this will be the lens I carry all the time, when I'm not specifically 'out shooting', in the daily bag, probably on the M7 or M6 (I'm guessing it won't go on my M5). The small size here is the key, as I find even the Summicron or Hexanon too big to slip in and out of the bag easily enough. I'm a 50mm shooter most of the time.
In looking at the design from a shooters perspective, I think that I'll like this very much, the gap in the barrel when open should make handling such a small item much easier than the 40 Summicron which is just too small for me as a quick shooter, I find myself fumbling with it more often than not, even after shooting almost nothing but the 40 for two weeks in an attempt to overcome this.
So, hood appears small, but is adequate? With hood & collapsed is this much smaller than the Summicron? Collapse sort of seems like an unfortunate term to describe this lens- for me collapse brings memories of complete mental & physical exhaustion- will I be driven to shoot this much??