Yes, it seems to be a pretty cool feature but you do have to watch carefully if you have strong straight diagonals, as they will often develop stairstepping. I'm happier to have remote focussing now.
Perhaps that has to do with sub-optimal sampling, i.e. with a sensor that lacks a proper OLPF (anti-aliasing filter), or not enough diffraction blur to function as such a filter. I have not seen many cases where the 'Diffraction correction' made matters worse, on the contrary, but then I use a camera with an OLPF.Cheers,Bart
When I bring up a folder of landscapes and select all, the diffraction correction will only apply to the viewed image instead of being selected for all.