Just driven the RC300h F-Sport today. I have an IS300h F-Sport so can compare to that.
Well its not a good start - the RC feels a lot smaller inside, Im 6 ft 1 and the seat had to be pushed all the way back leaving the rear seats useless. In the IS, I dont need to have the seat all the way to the back. The dash is the same with slight changes but whatever you do, don't go for black interior because its so bloody dark in there.
It doesn't drive great either. Its not IS that's for sure. Whilst the RC-F feels good in that it has a lot of power and feels smaller than it is, the RC300h feels somewhat fat and bulbous from behind the wheel. It feels EXACTLY like the GS300h, a car which I think is great as it gets you from A to B in absolute comfort and you never feel like you want to smash the throttle as its a luxury cruiser.
The RC makes you want to drive it hard but when you do it feels uncapable of delivering which is a real shame. Its just a rubbish feeling. The IS handles better and the rides is about the same but the RC feels so much bigger than the IS even though its not. Basically if you like the GS300h and are going to drive it like the GS300h, then buy one. If you're wanting handling then the IS is still better
The only thing the RC has going for it is the looks IMO, for some thats probably enough. The weight can be felt on the road around the corners even at a leisurely 40mph and its quite nose heavy.
Its an odd car and I cant really see who it appeals to. If you want handling then the IS would be the one to go for and if you want comfort the GS would be the one. The RC is trying to be a jack of all trades but it ends up being neither a great handler or has GS levels of comfort and refinement. Odd