Personally I am a Sharp fan. I bought a Sharp Aquos Quattron 46" LED LCD this summer and I am very happy. The extra yellow subpixel really does help make the picture "pop" on the TV.
I was going to say something along the lines of 'the 4th sub pixel does nothing but blow out colours'. But it seems the
jury is still out on that one. Now, you'll also have to read
this page on how what this pixel actually does, written by someone who knows LCD's.
I haven't personally seen the screen, so I'm not going to pass judgement, but from that 2nd link above, it doesn't look like that pixel contributes anything. Though it might produce yellower yellows, that might make all the difference.
As far as Sony is concerned I don't think a true Apple fan can buy a Sony product and feel good about it. Sony = Bluray which Apple is 100% against. Apple and Sony will soon be doing battle to see who wins when it comes to content delivery. I like Blu-ray and think it is a good technology, but depending on your level of dedication to Apple you might want to consider that.
You should check this page, because apparently Apple is against itself too.
http://en.wikipedia.org/wiki/Blu-ray_Disc_Association
And it's it's preposterous suggestion that you don't buy anything Sony because of a single product difference. Honestly, don't buy a Sony TV because, well, they don't sell anything that ships with OS X? See how silly that sounds?
Finally, if you ask, most people will consider Sony to be Apple's closest counterpart in the hardware market. High end build quality, good design, matched with higher pricing.