Originally posted by retsoor Thank you for your advice I might well upgrade to Lightroom 6 because of pixel shift
I wouldn't upgrade for pixel shift. The implementation in Lightroom currently is not optimal. It doesn't support motion correction and so if there are any areas of motion, you get really odd looking artifacts in water, tree branches, etc. Raw Therapee is a lot better, even than DCU.
Lightroom 6 does have newer lens profiles, can do HDR and panoramas and probably has a few other tweaks thrown in. I like it, but it doesn't do pixel shift very well in my opinion.