Funny you should ask. My E39 is a veritable ball of fire compared to my (sick?) E34wagon.
The E39 is less visceral than the E34s. More steering boost, a bit quieter, feels less "German" to me. Even has rudimentary cup holders.
Seats are definately better in the E39.
My GF who hates our E34 touring and loves the various rent a heaps she gets on business travel absolutely loves the E39 and has claimed it for herself.
Styling is a matter of taste of course, the E30,32 and 34 I think will be well regarded for a very long time. The E39 I find less attractive.