Preorders:
10-20mm at BHphoto. Adorama. Amazon. FocusCamera. FotoKoch DE. FotoErhardt DE. Calumet DE. WexUK.
15mm f/1.4 at BHphoto. Adorama. Amazon. FocusCamera. FotoKoch DE. FotoErhardt DE. Calumet DE. WexUK.
11mm f/1.8 at BHphoto. Adorama. Amazon. FocusCamera. FotoKoch DE. FotoErhardt DE. Calumet DE. WexUK.
The conclusion of his 10-20mm review is:
For pure photography where critical sharpness and best bokeh is required the Tamron will be the best one. When video work , compactness , AF speed is key The Sony PZ will be the best one
The conclusion of his 15mm review is:
The Sony is superior on many aspects compared to the Sigma : better sharpness wide open, better ergonomics for video, better AF, smaller and lighter, better resistance to flare, lower CA. The Sigma stays very good globally. Up to you to see if The Sony improvement are worth 2 times the price of the Sigma for your usage
The conclusion of his 11mm review is:
The new Sony 11mm F1.8 provide the best results globally in term of sharpness consistency + smoothness of background blur and best bokeh balls. The Zeiss Touit 12mm F2.8 is better in term of consistency across the whole frame but less good in term of background blur possiblitiies. The Tamron 11-20mm F2.8 Di III-A RXD is on par in term of sharpness but one stop slower. The Samyang 12mm F2 is very good globally but suffers from less good corners