I want to buy the lenovo y50 with FHD screen.But when I searched I found that it was a TN panel with 60hz screen I searched for it and I found that the colours were bad with bad viewing angles so I decided to search for 4k screen I found that it was IPS but with 48hz so my questions is what is the difference between 48 and 60 hz screens ?Is playing on 4k screen on a FHD1080p is the same as playing on a 1080pFHD native screen?