The 500 ISO doesn't bother me. I have been setting my ISO to 400 on most Alexa jobs to get the "cleaner" low-light look. 

I am interesting to know if you have to overexpose the Venice like all of Sony's Camera's. I find I have to be around +1 over get a true clean image out of the Sony Cameras. From any flavor of Sony, A7s-F65.

ND system is clutch though!

Cory C. Warner
www.corywarner.com
LA