Intel HD Iris 6100

Hello, I currently play on my desktop which runs great, I am looking into a new laptop and would like to be able to play FFXIV on it form time to time. I do enjoy the end game raiding which can put a real strain on a lesser machine so I know that may be out of reach for a non tricked out gaming laptop - that said the machine I am looking at has the Intel HD Iris 6100 and 16gb of ram. I have not problem turning the graphics down a bit, but my questions is, how playable will the game be? I am told this GPU is very similar to the Nvidia 840/850 M (I think?) Has anyone had experience with either card? I would mainly run dungeons, craft, level up, and easier raid content with this machine. The fast pace Shiva EX and t12 raids will still be done on the big ol' gaming rig. Anyway any info would be amazing! thanks in advance