Here's a shot from an M50/1.7 and a shot from a M28/2.8. Both ISO 200. K100D Super. Not sure of the aperture. That's something to consider for night-time shooting with an M lens: a small torch to confirm your aperture setting. Judging by the exposure times I suspect the M28 was stopped down more than the M50.
M28/2.8, 3secs
M50/1.7, 1/4sec
