Yes, I understand the cross-shopping of different brands especially when leasing. The risk is minimal given warranty coverage over the life of the lease.
I like the line about "I really don't have any pain, and don't feel particularly emotional about it." I had same concerns with my Lexus IS350, especially after owning a couple of Porsches (a Porsche is serious involvement, not just speed, hard to describe) as weekend cars for 10 straight years previously. My solution for the Lexus is "F-Sport" or my variation of since I'm primarily using it as a weekend kind of car. It gives the car the edge I require for a bit more emotional involvement and feedback. I've seen some other GS350's given similar treatment with similar outcome too. Just my thoughts or approach to a similar challenge...