I don't think that it is a threat in any regard. Auto vs. Auto and 6MT vs. 6MT the G35 would prevail (IMO with ease). Also, around the twisties, I still think that we have the advantage... Lastly, although the RX-8 has a nifty interior, it has nothing else. No class, no sleek lines, no style, no finesse. I would not worry about it at all. I actually passed one up today, it revved at me, and I rolled down my window, pointed, and laughed at the driver.