Once again if your FIL doesn't mind the 1 year warranty you can get a 46" tv with the x reality for cheaper price then the NX520.Doesn't hurt telling him the grey market option.
Interestingly after seeing this comment I also went out to Kondapur and checked and indeed it has been closed. There was one in Banjara Hills on Road No. 92 which leads into Rd no. 12, it was just below one of the grill restaurants there (the name which I can't recall). The only other Sony showroom I recollect is one in Begumpet which is quite far away.
A little Offtopic: I also went searching for HX850 today but wasn't there in Hyper City or Reliance Digital in InOrbit. Now I need to find some place where 46 or 55 inch HX850 is on display in Hyderabad
Doesn't the Sony website have details on its brand rooms? Of course some that have recently shut the doors may not be updated on the website. But site is usually updated every 15 days or so - at least reputed sites do update themselves.