I know your just trying to make an example but i must say the Nexus 4's screen is actually really good apart from the poor calibration out of the box, once calibrated (need to be rooted and custom kernel) it matches the iP5's screen in every area, only the HTC One has a better screen imo. Furthermore i have a Nexus 4 and i would like to know where this lag is??? Mine is butter smooth throughout the entire OS compared to the iP5 i have sitting next to it right now
Once calibrated? And you need to root and install custom kernel before you can calibstr? For the majority -- I'd guess at least 90% -- of end users, that's not a realistic option. As far as they are concerned, Nexus screen is inferior to iPhone, end of story.