Picture Quality.

[dipset420]

i havent watched a whole blu-ray movie i only saw a few minutes of movies at bestbuy on their tv's. anyway i want to know if there is a huge differnece in picture quality's for some movies.
because they had superman returns and it was good quality but could of been better i noticed it being grainy. and then the other day when i returned my ps3 they had the brothers grimm playing on the same tv and blu-ray player as superman returns was on the last time i had went.
and the PQ on that movie was the best i had seen. there was no grainy picture or nothing it was perfect.

so is there that much of a differnece between some movies??

also the tv i plan on buying is going to be 50 inch or smaller so would it be better to get a 1080p set or not