I was looking through my 2013 images and metadata the other day and found I had taken about 9 (out of 60 total) of my 5 star (my very best IMO) images with my mirrorless camera. If I widened that filter to 4 star as well (also really good shots) I had 99 (out of 582 total) that were shot with mirrorless cameras.
I also only had a mirrorless cameras or one type or another for about 3/4 of the year as well, so that bodes pretty well for it. It’s certainly much easier to carry around.
Now some of each of those totals, could be edits, duplicates, variations (ie B&W version), HDR version, etc. but those are the general numbers.