I have been rethinking my gear for a couple of months now. Recently got the Sony A7, very happy with its colors and overall look. Sold the M9 as I got tired of focus issues with rangefinder and lens calibration.
Now on to the S2: I have the S2 + 35/70/120/180 lenses. I don't use them much (size and weight issues), but when I do, the colors and rendering are just amazing to my eyes. Generally I take the S2 with me once or twice a year when I go on road trips.
I like to take landscape photos and clearly my skill is way below what is needed to take advantage of the S2 to the fullest. Having said that, I find its output very pleasing and more "organic" if it makes sense.
I am thinking of selling the S2 and lenses and getting the Sony A7R for use existing APO R-100MM, Summilux-R 80MM and some other older R lenses. Primary reason to lighten the load. No financial reason to sell at this point.
FWIW, I got the S2 relatively cheap and it underwent a complete overhaul in Solms Germany last year, free of cost. Lenses were also bought almost at 50% off retail in as new condition.
I am not a pro and do not make a living from photography.
Decision 1: Keep the S2 and lenses, even though it gets marginal usage and enjoy the system for next few years.
Decision 2: Sell S2 system and get the A7R to use with Leica R lenses and hope that it can render pretty much close to S2's output (not resolution, but overall "look")