For what it's worth, I've viewed the Sony, LG and Panasonic in both JL and Curry's (Currys had the better viewing conditions with the lights being much lower).
I have to say that whilst in some scenes the LG looks great, in others it simply has too much pop with unaturally deep colours.
Obviously, non of the tv's were calibrated so you could blame the settings, but just like the audience in the test, I found the brightness of the Panasonic 902b very captivating with HDR and the LG a little matt looking at times (somehow the picture didn't shine in areas you'd expect it too), and natural in shade 1 second but overblown the other. In fact, I thought in HDR mode, the Panasonic was actually superior colour wise to the LG - eg the 902b's built in HDR demo uses brightly coloured fruit and veg and the colours just seemed better than on the LG, really in your face, but still natural. By contrast the LG's jellyfish demo, looks completely un-natural and over saturated as does the fantasy world scene and the moon light sweep (where the shadow sweeps across the moon) looks wrong due to the lack of greys. The other space scenes were impresive on the LG, but I can't help feeling there's more to a good picture than just black and in that regard, the Panasonic looked sharper, more natural and much brighter when it mattered eg several water scenes with direct sunlight, leaving the LG feeling very flat and dull in comparison.
Which would I buy? I don't know. I'm drawn to the Panasonic although at 58" it's too large for my viewing distances as in the shop on SD tv it looked terrible from 10 feet! I think 55" is probably the limit or maybe even 50" with non HD /4K for me.
Still torn between an LG e6 or a 55" 902b if they ever make one! Couldn't rule the Sony out either. The Samsung 9000 on the other hand, despite winning the audience test, was a little like the LG - overblown at times and it just left me feeling that whilst some scenes were fantastic, others were severly lacking.