50 inch under 50k Sony
X7002 g - 2019 model good picture quality but non android and doesn’t have Bluetooth X 8000g - 2019 model has an inbuilt picture processor has Bluetooth and better picture quality than 7002g X 7500 h- 2020 model replacement of 7002g come with Bluetooth and picture quality slightly better than 7002 g
If u can increase your budget by 5-10 k you can get X 8000H this is 2020 verison of 8000g pq slightly better . Lg
Um 7290 pt 2019 best selling 50 inch budget model of lg comes with decent pictures quality but comparatively less than sony . Actually u can get 55 inch variant of this model under 50k overall value for money product.
If you are looking for good contrast television then samsung with its va panels gives you the best contrast ratio . With some compromise in viewing angles.
Ru 7470 - 2019 model one of the best selling model of Samsung has good picture quality and you can get it well under 50k if you can do good bargain. Tu 8000 - 2020 model there is no 50 inch variant in this model but this has the best contrast ratio of 6500:1 and peak brightness of 450 nits which is the best in this price category . Comes for around 55k
my advice is go do window shopping in shops around you. See the picture quality yourself and its better to buy offline than online you can get more competitive prices