Do the latest Xfinity X1 TV Boxes have VISUAL and FULL SCREEN Rewind and Fast Forward on TV?

Do the latest Xfinity X1 TV Boxes, including the 4K wireless one, maintain the same rewind and fast forward experience on a TV as the older boxes such as the XG1-A?  Most importantly, I'd like to know whether Rewind and Fast Forward are still both VISUAL and FULL SCREEN at all speeds except the fastest of the 5 speeds?  (I.e., you see a quickly moving picture as Rew or FF progresses.)

Related questions:  Does the answer differ for watching a DVR recording vs watching Live TV?  If so, how?  (There's no such difference with the XG1-A.)  And are there still five Rew/FF speeds as with the XG1-A?

Thanks in advance.