The F3 is surprisingly not much bigger then Nikon's smaller SLRs. However, it definitely has more substance - weight.

As far as balance is considered, I tilted all three forward (without lenses) and they all would fall forward past the 2 o'clock position so they all have the same balance.

With the MD4 the F3 stands taller than it's contemporaries but is actually quite svelte compared to the modern design like the 1V.