Slowly getting more reviews of this lens. There was some hype at launch date that it exceeds the mighty Nikon 14-24mm. From the reviews it is obvious that the Tamron does very well but the Nikon ultimately likely very marginally better, at a price. The Tamron does better at 15mm than the Nikon at 14mm but it is know that the Nikon improves significantly by 16mm so the difference between 14mm and 15mm could be quite substantial. Another aspect in the Nikon's favor is the high contrast.
http://www.lensrentals.com/blog/2015/02/just-the-lenses-tamron-15-30mm-f2-8
http://www.lenstip.com/432.1-Lens_review-Tamron_15-30_mm_f_2.8_Di_VC_USD_Introduction.html
http://www.ephotozine.com/article/tamron-sp-15-30mm-f-2-8-di-vc-usd-review-27173
Will update with more links as reviews come in.
Edit: Added ephotozine
http://www.lensrentals.com/blog/2015/02/just-the-lenses-tamron-15-30mm-f2-8
http://www.lenstip.com/432.1-Lens_review-Tamron_15-30_mm_f_2.8_Di_VC_USD_Introduction.html
http://www.ephotozine.com/article/tamron-sp-15-30mm-f-2-8-di-vc-usd-review-27173
Will update with more links as reviews come in.
Edit: Added ephotozine
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