Re: am i expecting to much (summicron 50 on mp set to infinity)?
I'd suggest there's definitely something wrong with your lens.
I have the latest version of the 50 summicron and it is acutely sharp. Even shooting wide open at infinity the sharpness is not dissimilar to the image you shot above with your summilux at f8. Being unable to align the RF at infinity would also trouble me. There's no reason why this should happen except for poor calibration in the RF mechanism or the lens gearing; it's certainly not something that happens on any of my cameras.
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