thx for your input.

UV´s are laid out on every object nicely. I used to do a lot of modeling in the past for realtime renderers, so I am used to build my stuff clean and error free from start.

I read about unified sampling and thought it would be terribly interesting to play with it. unfortunately we run maya 2011 in the office, and since this software is so buggy I often thought about going back to maya 7 - in my opinion the last stable version. but my job is focused on rendering now, so that wasn´t an option.