Hello!

Welcome!
Scene looks nice. I would like fix some ideas there:
- surfaces (materials need really improve) next release of Kray will have good system of Nodes created by me and Jure which will help very much.
- the ceiling lights are very strong so in reflection surfaces we see strong blur - I am not sure but I always use fake halogens bulbs + soft lumi panels. Area lights make longer renders - I know better shadows because is raytracing - but with lumi poly renders are faster and cleaner
- one more hint: to render better metal put always small blur on them (0.5 - 1.0 %) - AA will look better because small reflected details in reflections will be blurred and surfaces will look less "sharp" in these regions .