I don't know about the Porsche but my wife really likes the Q5's. We did test drive a S Line version of it and I was ok with it for what it is worth. It is much better than X3 hands down and she had no interest in MB.
I think people are being a bit too harsh on the Q5. I am going to go test drive the SQ5 as well but for its purpose (driving in town to go get groceries and some spirited drives) it is appears to offer a good package.
I can always try to convince her to get a CPO Cayenne GTS as well.
It is no M3 or 911 replacement by any means.
Current: 2016 F10 535i xDrive AW w/ Black Dakota, ZMM, ZCW, ZDA, ZDB, ZPP, 688 & Black Grills.
Retired: 2011 E92 M3 -AW
....ED April 29th, 2010
Retired: 2007 E92 335i -Space Gray.....ED Oct 19th, 2006