[Q] FHD playback on QHD display & 4K recording length?

Hi I currently have a Sony Z2 and HTC One M8, thinking of upgrading the Z2 to something better like the G3 or new S5 advance but I only have two questions that G3 reviews did not answer and they are:

1. How is the 1080P playback on the QHD display of G3. "The reason is that most steaming sites do 1080p and the ones than do 1440p are either of sub par quality or of a processed type. A call to one of the streaming sites confirms the same they have two video sources FHD and UHD there are no QHD sources"

2. How long does the 4K recording last? "My Z2 records 4K only up till 5Min which is crap and a complete joke had I known this limitation would have chosen something else, the 1080p recording is worse to HTC One M8 performance that is a slap on its face"

nap007 said:

1. that review uttered a total nonsense any screen can playback whatever kind of res a video have as long as the hardware and software are up for the job, it's more depending on the source file itself.

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Its not that if G3 can playback 1080p its more of that how does 1080p look on a QHD screen. For example I have a Dell U2713HM with a 2560x1440 WQHD resolution but when I play a 1080p movie the quality looks less than on a Dell S2740L because the source and screen both are 1080p.