The interior of newer BMWs may not have that "wow" appeal, but it's hard to deny that it's still a top notch interior. Personally I think the newer BMW interiors are much improved over the last generation BMWs which today look quite dated.
The 370Z may have an improved interior, but BMW will still take it in this department. Personally, I've never been impressed by the interiors of Infinitis so I doubt I'll be impressed by the new interior of the Z. With that said though, I'm sure it's a good improvement over the 350Z and should fit my needs just fine.
I'll choose a Z as the more sporty and fun to drive car, but the BMW as the more comfortable, luxurious daily driver that's plenty enjoyable to drive in itself.
If you guys want to compare used prices, low mileage 335i coupes can be had in the mid to low 30K range.
Though similar in price, the 135i vs the 370Z may still be comparing different segments of cars, so the 370Z versus a 335i is an even more lopsided or unfair comparison. Personally I'm looking forward to the new Z4 versus 370z comparo.
Oh and I liked this edmunds vid