The 55SM9500 has more dimming zone ...they call it "full array local dimming pro". But unfortunately it is not available in India.
As for as the SM9000 is concerned it is a fantastic TV. The amount of blooming and negative effects of the lower dimming zone is not that much offensive it is quite acceptable if you see the image quality and colour depth. As for the black level ... this TV performs very well in average bright rooms. The black seems very promising. In dark rooms the blooming effect could be about10% irritating ...90% of the time is is not noticeable.
(Please ignore my previous message.)
You mean even in dark room, only 10% of time, blooming effect is visible? If so, Then it is not an issue, at least for me, because I always watch TV with some light in the room.
Actually, me too (like you), after a research on web, trying to buy LG 49SK8500. The reasons are same as yours such as FALD, Multi HDR support, 40w sub woofer speakers, hi end features which are otherwise only available in OLED........and due to room space, I prefer 49" whcih is only available in SK8500. But unfortunately, it is not available anywhere in stores. So I choose 55SM9000 as it is latest advance model than SK8500. But the only thing which makes me hesitate is the lesser FALD zones (The other thing the size 55" - I can manage however).
By the reply from you, as a user of the TV, I came to know that it is fantastic TV, if we watch it with a medium light in the room. So, I am thinking of this SM9000.
One more query, have you checked SD content? Who it is upscaled to 4k? How is the upscaled PQ?