Apple 4K tv models MP7P2LL/A vs A1842

I just picked up an Apple 4K tv model MP7P2LL/A. What are the upgrades in this years model-A1842-5th generation vs last years that I found in terms of 4K? I’ll only be using this to rent or buy 4K movies on. Not sure if theres a big upgrade from last year. Thanks for the help guys and gals.