I concur with those who prefer the LC on the following grounds:
1) LC is less "blingy", has a cleaner and more discreet look
2) LC wheels, tire size preferable to those of LX (cleaner, more practical)
3) Toyota nameplate blends in better than Lexus nameplate in most areas
I bought my 2011 LC about four months ago, have about 5,000 miles on it and have been very happy with it so far.
I can think of two things that I'd improve if I could:
1) the LC headlights are inferior to Xenon ones available on many cars. This might be due to the height of the headlights and the risk of blinding oncoming drivers. Nevertheless, it would be nice to have some sort of lighting solution which would light up the road as well as some other stock vehicles can. LX seems to have a different lighting system, but these seem to be Halogen as well ("projector beam halogen"), rather than Xenon.
2) I actually like radar cruise control, having had it on another vehicle. LX offers this but LC does not.
Other than that, I can't think of anything else that I find superior in the Lexus to the LC. I think the LC interior is perfectly fine, and that the upgraded stereo is perfectly fine. I have no need for an electric tailgate or electic third row seat flipper-uppers - these are well-designed and balanced in the LC and can be easily operated with one hand as is.
To my surprise, I love the keyless entry system which I have on the LC (and surely also is available on the LX). I got used so quickly to being able to walk up to the vehicle and open it without a key or remote button, that I now try it on other cars as well and am disappointed when I have to get rid of whatever is in my hands in order to dig up the key or the remote.