I'm pretty sure this would also be an issue with screen. The pair maybe able to operate on separate 'windows' at different sizes, but would not be able to view the same window at two different sizes at the same time.
Re:Tmux, for fun and profit
by technomancy on Tuesday April 10, 2012 @04:36PM
(#3824273)
Actually Screen is even worse; it sets the size to whoever joined last. So if someone with a big screen joins a session of someone with a small screen, portions of the window will be invisible to the person who started it.
C-a F will resize screen window to size of your terminal.
3) Tmux sessions are restricted to the size of the smallest client connected to the session. We've recently started using it at work and it works fine for 2 of us, but 2 others found that the resolution differences between their 13" and 15" macbooks means that the 13" sets the tmux session size so the 15" doesn't use the whole screen.