I'm going to differ with the sentiment here. My last C4D version was R20, but I have returned with R25, and one of the biggest reasons is the improvement in the scene nodes. As an avid Rhinocerous gH modeling expert, I can appreciate what is happening here and see most of the modeling advancements here and not so much in classic C4D modeling. At first, the UI was a stark change in R25, but I have adapted and do not want to return to any classic C4D UI. I have owned all versions of C4D 8 up to 20 and now 25.