@ p3d
If it comes to render times - I totally lost track of it, because of the amount of images I produced during tha last days (some of which will never leave my HDD to be viewed by people

If it comes to sharpness and smoothness - I noticed that filtersize at default value 1,5 gives the best sharpness-smoothness ratio I needed. Anything below that gives visible steps on the edges, and anything above, blurres an image too much to have tiny details look sharp (at least at about 2/3k resolution) - if I'm wrong, someone please let me know. I also make renders at least twice as big as the images I post (except for Gilbert detail 03/fixed, which is a cropp from an original render). Resizing in postprocess leaves more deails with smooth transitions, than making renders with filtersize at value 1 - quite sharp image but the edge looks unacceptable.
New images to be posted here really soon, so please stay with me to give C&C.
PJ