To put this issue to rest, I put print commands in functions responsible for analog input and while moving diagonally on keyboard seems faster, it's rarely useful on most team maps due to small amount of open spaces and narrow corridors (speaking about Crag Castle here and similar.
I also checked out my analog gamepad, which is an 8Bitdo Ultimate Bluetooth controller and we are not getting the perfect [1, 1] vector like you can get with the keyboard.
However there's also an unknown factor in the form of the Spaz node itself. We don't know all the calculations of movement that are done, because part of them are hidden in the internal layer itself. However, if the direction and how far away we push the stick are treated separately, we can effectively move at maximum speeds even if diagonal vector isn't normalized. If that's the case, then no, keyboards do not have faster diagonals.
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