Mark - thanks again, and hope to see you at the next meeting. On the NEX, I've been fine with the 16mm+converter, so would probably stick with that if the a6??? looks good enough to keep from spending £££ on the full-frame upgrade - especially if the Nauticam APSC housing goes the same way as their new Oly EM10ii (Mr Lai, please take note!). For macro I'm using the Zeiss 50 - so would be good to compare notes if you guys are up and running with the 90.
Alex - thanks, helpful as ever, and it looks a very interesting option ... if I can persuade Hazel to trade more baggage allowance!