is e-infinity a grey import site ! ?
Though the Tamron is a lot bigger than the Sigma and the Optical Stabilisation would be nice in the lens. I can live with out that if the IBIS in the A6600 is good enough ! ?
I am looking for a sharp lens and f2.8 will help low light situations as APSC will struggle more than Full Frame in low light. Though I have a Canon EOS 7Dii I do own a Sony NEX5R with 18-55 OSS f3.5-5.6 lens, so the focal length will be ok for me as I use this camera for city breaks and for hand / carry on luggage.
One of my other Sony E mount lenses is 50mm f1.8 which is pretty sharp !
Another reason I want to get the A6600 is the eye AF detect AF which is IMO a game charger !