I started with an HP EliteBook 850 G1 and fell in love with those laptops immediately. Then after a year I upgraded from that to an EliteBook 850 G2, and fell in love with that one as well. Now I've upgraded to an EliteBook 850 G3 and I must say the same, this laptop is absolutely perfect and I love it!
The previous versions, the G1 & G2, had two graphics cards, which many may already know doesn't play very well with Linux, at least not by the flick of a switch easy, but the G3 that I have has a single Intel HD 520 GPU. The G3 that I have has an Intel i5-6300u, 8GB of DDR4, and a 256 Samsung SSD.
Long story short, the G3 so far has full support, granted I've only been on this for about 30 minutes. I have yet to test the USB-C port and the NFC feature. Bottom line, this baby roars with buttery smooth frame rates with no tearing.