370Z is getting pretty long in the tooth. RC350 is more modern and should be superior in every way. I have always felt the 370Z drives a bit "fat". It feels so much larger and heavier than it should be, without offering the comfort usually associated with larger and heavier coupes.

 

The 370z weights about 3200lbs. I think the IS350 clocks in at around 3500lbs.

 

comparisons between the two will be interesting.
knowing lexus they will have an F-Sport version of the RC350, giving it even more of an edge over the 370Z

 

Nissan has another Z car coming out, hopefully with that they focus on cutting weight even more, right under the 3000 mark would be sweet.