Best. LOL. The only plasma I would even consider is the ZT range from Panasonic, but that has a huge pricetag on it. Samsung's 75" looks sublime this year and Sony's 4K sets are absolutely amazing in person, the colours are just a cut above everything else. If one were to buy the absolute best in class, then it's last year's Sharp Elite, this years ZT, the X9/W9 from Sony or the 75" LED from Samsung. The W9 probably has best bang for buck out of all those listed, but it tops out at 55" which is much smaller than the 75" Samsung.
The Sharp Elite is probably the best overall TV, but it's very costly and it still has small issues, but nothing like what plasma still has, burn-in, DSE, dithering, banding, buzz, flickering, terrible light output. Fuck all of that shit, I returned a VT50 last year in favour of a 55" HX850 and never looked back. I'll be waiting diligently for the 2014 Sony/Samsung 4K LCD/LED line up thank you. If Sony had HDMI 2.0 ports and no ugly or detachable speakers on this year's X9 I would definitely be considering it, with those speakers and no HDMI 2.0, I will wait for next year's model, I just hope they keep the TriLuminous tech or buy QDVision. OLED colours with no burn-in...