Mobile is where things are interesting. My laptop can encode H.265 video faster than my desktop, due to extension support, and it's only 15 W vs 91 W of my desktop. Desktop is bleh...still sort of kicking myself going from Lynnfield (Core i5 750) to Skylake (i5 6600k), since I had my 750 massively overclocked, and the performance between the two ended up so similar. There are other benefits, but sometimes I miss the days of the early 2000's. Now, I just figure that slapping in an SSD, maybe RAM will do more than a CPU upgrade could do. 4k is a different beast, and Windows needs to improve its high DPI support, but working with an 8 MP resolution screen in glorious in Lightroom. Some games are better than others (obviously), but they do look good too. Freesync is a nice perk too.