I had a chance to drive the new 5... the lesser weight makes a big difference. I personally like the everyday feel of an SUV though. Sedans just don't do it for me for whatever reason. And looking in the 5er backseat space, it looked pretty small... nothing like the X.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr