QUESTION on the Recent Panasonic TX-50CX802B review

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I see that the TX-50CX802B has just got a glowing review, hitting 5 stars.
http://www.whathifi.com/panasonic/tx-50cx802b/review

Would be be safe to assume that the 40" version of this TV would be rated just as good?
https://www.panasonic.com/uk/consumer/viera-televisions/led/tx-40cx802b.html

Or am I perhaps just best saving my money and going for the TX-40CX680B instead?
http://www.whathifi.com/panasonic/tx-40cx680b/review

I also have been looking at the Sony options as well, both the 4K and 1080P versions. Open to thoughts and opinions on them as well.

http://www.whathifi.com/forum/tvs-and-projectors/4k-or-not-4k-panasonic-or-sony-panasonic-tx40cx680b-or-sony-kd43x8305c-or

 

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The bigger set in this range has have better backlighting.But even the 55 inch has a limited zones but calls itself 'Full Array light dimming' which is 'better' than edge lit backlight used with the smaller models but isn't pukka full backlit.....
The set in 55 inch or higher is liked by many critics so far so you can happy to go with this....it is Panasonic's year in LED.