Sorry - a while to get back there.
Yes - a lot of shooting wide open - they are *very* shallow - but it works great.
there are a few sample shots on
www.pixelmill.com.au in the news / news archive.
I also like the SIGMA 24-70mm EX zoom - f2.8 constant - not too much breathing - and sharp! i got mine for AUD$500 *NEW* from Hong Kong on eBay.
I look at the RED lens - everyone is really excited - but Sigma have a good 2.8 constant zoom for 400US!
Anyway - everyone can do a longwinded tech analysis - but it is better [IMO] than the zoom an a Z1.....