Title - the katana has a lot of screenshake both vertically and horizontally, and it makes me a little dizzy.
I think part of it is that the screenshake lasts for longer than the swing itself, has different screenshake for the different swings, and has more movements than any of the other weapons in the game (i.e. the swing from left to right moves your crosshair left before the swing, right during the swing, stays to the right until the swing finishes, then moves left and "overcorrects" before moving slightly right to reset your aim).
I would like it if the screenshake was reduced and/or sped up so that your crosshair isn't freaking out whenever you're swinging it, and that your crosshair isn't moving after the swing is done.