i have a Sony 32"cx420(FHD), ...& sony usb media playback& support is downright pitiable,particularly compared to Samsung & LG's!.....mkv is supported only in those 2011 Budget lcd tv that that has the older BE3 PE,like the Cx30,cx420 or the cx520 & mkv playback there too is miserable,...about 40-50% of these mkv videos r Not played at all or played distorted! Add to that ,these 2011 BE3 Sony's doesn't display any sort of external subtitles,doesn't support custom zoom levels through usb nor can they output DTS audio stream in ur movies & at top of that r priced more than the competitors like Samsung ,LG,which has the Best feature filled tvs & has no such usb playing issues!
Now,Panel lottery issue apart,which again i think 80% of aam public/viewer could never find a difference in the pq of amva vis a vis spva, ,but is guaranteed on a sony, ....a Samsung tv offers Best & competitive pq & best vfm tv's in the mkt. today!
Anyway, do ur personal research & findings b4 u buy ur tv!
*btw, 40Cx520 is Not available in India through the official channels!