Maybe you’re not noticing the difference between 720p to 1080p is due to the decoding used. The rips with a lower file size often get there by means of compression, and some uploaders (such as YIFY) heavily compress the videos to where I don’t even notice much of a difference, however I’m going to assume you’re not downloading the 3GB (average size for HQ) 1080p film.
Then again eyesight plays a role along with display.
I wouldn’t bother with 4K usually, however once I upgraded to a 1440 monitor downscaling from 4K actually provides a fair bump in overall sharpness and detail (some films more than others), however the file size is usually over 10GB per film.
In ear earbuds. I blimmin’ hate them but my Audio Technica over ears are too bulky for the gym.
Bit off topic, though if anyone could recommend cheap but decent wireless headphones, for the gym, that are not in ear I would appreciate it a lot (I’m in the UK).