I'd be surprised if the XOX version isn't higher resolution.
Jez has a MS slant since we works for a windows blog, so lets all take that into consideration.
But.... given that the difference is much larger between XOX and PS4P than it was between XB1 and PS4...and that many devs have said they've got their XBX games running fast and stable at 4k with minimal effort -- well it's going to be a shit show.