I've driven myself mad over the last few weeks! I started to think about the Sony Zeiss 50 1.4 ZA as I have a 35mm and a 55 at the moment at its supposed to have a nice bokeh ..... just can't quite get past the Sigma 40 for the moment though. Waiting to see if there are any good deals about in November. I did like the Batis a lot but it missed eye focus at close quarters more often than I would like and sometimes the bokeh could be a bit busy.