Earlier quoted context omitted.
Note that if you pirate 1080p or 4k content you'll always get the full resolution you asked for.
Not always at a great bitrate though. I haven't really torrented anything in a while but I doubt there are many 20GB+ Blu-ray quality rips out there that you can download in a reasonable amount of time. EDIT: after reading the replies I stand corrected; it seems like there are some better quality uploads out there than I thought.
I seriously can’t tell the difference between a very low quality YIFY rip and a proper Bluray. If you freeze frame they both look bad, and when they’re moving they both look great. I’ve done this as an experiment multiple times and it’s like judging wine... There’s a threshold you need to pass but beyond that you quickly run into diminishing returns.
[1] BTW most movies are still mastered or partially mastered (SFX) at 1080p still, and even if they’re true 4K you get high quality downscale to 1080p for free. But really most 4K movies are still upscaled from 1080p.