From what I know, the C2X and C2 are the same except for the color of the back panel.. If you meant premium as in design, then its subjective, but its the same otherwise.
Got a G2 on Dhanteras.. was quoted 1.85 - 12.5k discount.. got it down to 1.75 with 12.5k discount.. Nothing extra.. no LG tones as some members here got..
I know some here got a slightly better deal, but the 65" G2 for 1.625 seems like pretty good deal.. enough for me to pull the trigger.
I agree on C2X vs. C2 - same in specs and MRP too in LG IN web site. I missed to mention "premium" is what the RD sales person stated to me because they do not sell C2 and not my words . It looks like RD and Croma seem to get only the C2X variant and other dealers get the C2.