I have the 40" (5K) and it's perfect. Replaced a 27-32-27 setup (the 27"s being portraits, the 32" landscape). For my coding and office work, absolutely no reason to go wider. Highly recommended.
Note the 40", and probably this one too. support MST which makes the display appear as two monitors to the OS and is great in terms of window management without going too fancy with custom software.