I bought and have been using the Acer Iconia W4, it's a small compact 8" Windows 8.1 tablet using the latest Intel Atom Baytrail processor, check out my short video review here.
When I got the Acer W510 I found that it was a pretty decent media consumption machine, but the new Intel Atom Baytrail in the Acer W4 is just AMAZING when it comes down to watching videos, having NO ISSUES at all consuming H.264 videos of high bitrate. I'd say that the fact that it has so much processing power at it's disposal and since it's running on PROPER x86 Windows 8.1 it's pretty future proof to playback H.265 videos as well. Check out the video proof here.
I've actually done numerous videos regarding the Acer Iconia W4, and I have a few more down the line, so check out the playlist below and subscribe to get informed when new videos get added. View the playlist now.