500h FSP reviews are very positive so far, even from people who are usually quite critical of Lexus, like Redline. Seems the new 2.4T (RX 350) is faster on paper but "feels" slower to reviewers compared to the V6.
With comparisons to the X3, X5, Q7, RDX and MDX, one of the RX's core strengths has always been overall passenger comfort and space, and that feeling is not really something you 100% pick up on a spec sheet. Yes you can compare dimensions for hip room, leg room, head room, rear seat leg room, etc but RX has been fighting this battle for a long time now -- and winning -- with real buyers.
RX being in it's own unique class means media are always reaching from below (X3, Q5) and above (X5, MDX) to try to draw comparisons but the ultimate result is that those comparisons are not indicative of real shopping habits, and they aren't apples-to-apples either.
One of my good friends has a new X3 and it feels much less comfortable and less spacious than even the current RX. It feels much more "compact" than midsize IMO. As savage geese mentions, X5 second row space is also not quite as comfortable and "big" as the RX feels. X5 and MDX have smaller second rows to try to squeeze in third rows -- not a compromise the RX has to make.
TX will be the direct competitor to Q7, X5, MDX, etc. The only real competitors I can find for the RX are the 2-row Mercedes GLE and Audi eTron. Everything else is quite different depending on size, packaging, rows, etc.
I say all of this because while we rush to draw comparisons to RX 500h FSP with 0-60 times, I 1) don't think real buyers are going to really be looking much at that metric and 2) think Lexus has a wide open space here where the RX 500h feels larger, more comfortable and brings "Lexus-ness" to a performance set where it didn't exist before. I don't really expect an X3 M40i buyer to be cross shopping an RX 500h FSP, but I do expect former IS/GS 350 F SPORT owners to consider it as an option, as well as some move ups from NX and former RX owners wanting more performance. Lexus knows that and it's why they did this.
Building out a GLC 43 AMG and spec'ing it similar to RX 500h FSP (+premium paint, +21" wheels, +AMG performance studio package, +leather interior, +ventilated seats, +heated steering wheel, +multimedia package, +Burmester surround sound, +wireless phone charging, +driver assistance package, +surround view cameras) = $73,220+
GLE 450 stacked with similar options comes to $78k.
New RX is a home run.