Let me start with..... the mk2 is so much better than any previous Olympus camera and i believe only bettered by the Sony A9. For all intents and purpose even for most action sports electronic shutter is eminently useful and pretty much all i've used since day 1. As many likely now I shoot as much tennis as i can get to and the EM1mk1 would see the classic bent racket rolling shutter effect. This essentially went away with the mk2 unless you were directly side on to a high speed server were the racket head would be moving close to 100mph at the top of the swing and then you might see it reappear... However...... it's still there in an annoying manner and here's three examples to show what i mean, all photos originally in landscape mode In each case the ball is in the racket strings. This is Ash Barty currently ranked in the WTA top 10 and she has a fairly powerful hitting style Low to the ground, both the ball and the ball shadow seem to be in the same place Subscribe to see EXIF info for this image (if available) 024982-_2119184 by Phil Gartner, on Flickr Here the racket and ball are at shoulder height, the ball shadow appears to be quite a few inches in front of the racket Subscribe to see EXIF info for this image (if available) 024987-_2119235 by Phil Gartner, on Flickr Now one from a server Again i caught the ball in the strings but the ball shadow ends up quite a way in front of the racket Subscribe to see EXIF info for this image (if available) 024984-_2119212 by Phil Gartner, on Flickr It's not something you notice in a majority of photos but is obvious in these cases.