To be honest, I thought the IS-F drove much better on the track. I don't know if you care or not, but the IS-F cornered better and felt more like a driver's car than the RCF.

The IS-F pushed a little in the corners but holy cow, the RCF plowed through them. And that's driving them back to back on Sepang Circuit. I also thought (on my own butt-dyno) that the ISF was faster exiting corners.

 

Do you want 2 doors or 4? Do you want to spend more or less?

 

I came from a '13 ISF to a '15 RCF.

ISF feels markedly lighter on its feet which I prefer. You definitely feel the weight on the RCF at all speeds. ISF you don't or much less so.

I found the pre '11 ISF interiors to be econobox along with the dated looking headlights so comparing newest to newest, the RCF is certainly up several notches, but the ISF wasn't bad either just much simpler in materials and design. Typical Lexus feel for both which is a great thing.

Transmission and engine feel similar at full song, but the shift responsiveness is markedly better in the RCF on downshifts. ISF was plodding at times. RCF might also sound a bit better at the higher revs. More urgency, more thrum.

Looks-wise, though subjective, it's no contest and I liked the ISF exterior. RCF is the most daring and best looking coupe in production today south of supercar status. ISF could not come close to making such a statement. The one thing I really wish Lexus would've done is option up a full leather interior plus alcantara headliner. The rubberized dash is not my favorite. Thank goodness the headliner is black at least.