Mac OS Sierra 10.12.1 Dock behaviour and command tab issue
Yes. I have a mid 2015 MBP which I have upgraded to Sierra from Mavericks and before that all the way back to Lion.

I find that Cmd-Tab frequently (more often than not) fails to tab to the correct window, stopping 'one short' which suggests that the list of icons displayed when Cmd Tabbing is different from the internal list of programs that it cycles through for some reason.

I also recently had a problem (for the first time) where Terminal windows failed to show in the task switcher at all until I restarted the OS.