hi first post here, I'm thinking about to get the iMac retina , but I'm very confuse about the basic knowledge of screen resolution. i hope you guys could help me out. if i use 5k iMac to watch a 1080 video will the quality look bad ? (lets say i use a a good quality full hd monitor vs iMac 5k watching a same 1080 movie) will iMac look pixelated 0r both quality is the same ? and same question on gaming too , i think for the gpu in 5k iMac i think at most i can ply on 2.5k resolution on gaming. im not editing video or photos. theres no 4-5k movie in common yet if 5k will decrease the lower resolution more i will skip it then.