After waiting for months for an f/1.4 -35mm lens, which can tick all the boxes- fast autofocus, sharp from f/1.4 without any CA (need more testing in harsh sunlight conditions), super-sharp from f/2, amazing color rendition (feels neutral) and bokeh (bit cat-eye in corners but buttery smooth).... all under $1000..... Tamron has finally delivered (Canon EF version).Weighing 815 g, this lens feels so so good in hands, and it balances with the DSLR so beautifully. I know you will compare it with Sigma 35mm f/1.4, but I am happy to say that the fast autofocus of the 2019 Tamron lens kicks 2013 Sigma's ass..photo and video... both during daytime and in low light. I have previous experiences with Sigma Art so I am writing this with confidence. I rented the Canon 35mm L II once. Given that the Canon is a $1700 lens and only 50g (give or take) lighter, the Tamron offers far better value..... with similar image quality (feels sharper on mirrorless), weather sealing and metal construction.I have a Canon 6D and Sony A7III. I haven't calibrated this lens for 6D yet. Image looks decent without calibration in 6D. But this lens is for the 40+ MP pro bodies! It is tempting me to buy the EOS R! I am not a fanboy of either Sony or Canon's. I love the best of both worlds. And Tamron is delivering amazing options for both worlds! When they declared they have put all of their experience into this lens, it was not an overstatement.I adapted it on Sony A7III with the Sigma MC-11 and I must say, It focuses in my bedroom at night as fast as the Sony FE 24 mm f/1.4 GM which I own! However, with the adapter it goes around 1000g on the A7III. Also, in my completely silent bedroom, I can here the noise of the autofocus motor moving. I don't think it will affect video recording in outdoors. I will keep testing. But the quality of image I am getting is absolutely worth it.I am writing this review as my initial impression. I will keep updating and add pictures as I try it for astrophotography, and landscapes...portraits as well.This review is entirely my subjective opinion from two-days experience. Please take it with a grain of salt. But I expect this lens will become tremendously popular as soon as Tamron brings its mirrorless version in the market. Until then, I will keep and adapt it.Update 1:I adapted it with Sigma MC-11 on the Sony A7III and captured all images handheld.1) ISO 3200, f/5, 1/50 s: 'Settling after the spinning ride'. No chromatic aberration against harsh highlights2) ISO 200, f/4, 1/4 s: 'Waiting for the ride'. Handheld at 1/4 s! Look at the sharpness! And color rendition!3) ISO 2500, f/1.4, 1/500 s: 'Thrill of the ride'. It tracked the baby girl at f/1.4 and got sharp image. I focused on the vest. Face is not super sharp because of thin depth of field.4) ISO 2500, f/5, 1/20 s: 'Please dad, one more time!' Sharpness and colors again! No color fringing on the steel rails!5) ISO 100, f/1.4, 1/30 s: 'Bokeh balls or lemons?' Bokeh becomes cat-eye shaped in the corners. But it looks buttery smooth. I focused on the harsh LED lights but again, no fringing. Amazing!6) ISO 3200, f/1.4, 1/800 s: 'Our moments.' Again tracked at f/1.4 and got sharp results. Remember this is a DSLR lens adapted on the mirrorless and focusing in low light! Monstrous performance!7) ISO 640, f/1.4, 1/125 s: 'Lets play this!' Sharp from f/1.4 and smooth out of focus background.8) ISO 640, f/5, 1/8 s: Just look at the lightburst at f/5 only! How cool is that?!9) ISO 320, f/4, 1/4 s: 'Machine In duty.' Park rides can't get any cooler than this!10) ISO 3200, f/5, 1/20 s: Last picture to show the park and the rising moon. All under focus and super sharp.Yes this lens weighed around 1000g with the adapter but the build is solid and I can grip it well with my L-bracket attached to the camera. And yes, I captured these images in RAW and applied basic edits.Ask me if you have any questions.