Yeah i have done that on mine and same as yours, small steps between colours, however i have tried a different test, cant remember the name atm, but that proved to be much better, im still on the fence as who to believe as LG uk have stated 4 times now ive spoke to them about it being 10 bit, they have it on their website, also on their youtube videos, and also a uk review on s21.com stating it is a 10 bit screen, but then on the other hand us sites claim it to be 8 bit, and then you have these gradient tests. Whos brave enough to open one up and have a look at the panel to find out for definite lol
If it's so hard to tell whether it's 8 or 10 bit then it doesn't really matter does it? If we have to stare at test images rather than watch movies.