I'm not upscaling, my tv is native 1080p it always upscales if shit comes in at 720p which is what gta5 is coming in at according to my display info despite my ps3 being set at 1080p.
My TV must be different then. It's 1080p native resolution too but it does not do upscaling on it's own. Whatever signal is broadcast to it is what the TV presents. My PS3 menu comes in at 1080p, but then if I play something like The Last of Us, it switches to 720p.