It's a bit odd that EU3 doesn't reflect any of this. I mean, his capital was in Vienna for almost a decade, but if you load up EU3 during those years you'll see ~100k Austrian soldiers on the Hungarian border while Hungary itself only has a total of ~40k.
[patriotism]
for some reason EU3 favors Bohemia over Poland and Hungary (also the military boost for the HRE Emperor is enormous - not to mention Poland and Hungary being in the eastern tech.group and with the GH at their backdoor)
[/patriotism]