There are more “Full Frame” lenses to choose from than ever, but the Sigma’s have so much going for them. They all open up to T1.5, even the wide 20mm. They also have matching gear positions, so lens changes are quick and easy. They are small and light-weight too, so they are perfect for gimbal work.

PERFORMANCE
Sigma has taken advantage of modern lens design techniques and a new generation of exotic glass to create their first series of cinema primes. The lenses are sharp from corner to corner even wide open. The images are free from almost any aberrations, including the purple/green fringing you often see in high contrast situations with high-speed lenses. If you do some research, you will find that these lenses are almost always compared to the Zeiss Otus prime lenses, and the Sigmas perform just as well. In fact the Sigma 85mm T1.5 actually outperforms the 85mm Otus in many ways and was the highest performing lens ever tested by DxOMark! Breathing is extremely well controlled. The 20mm and 24mm have virtually no breathing and the 35mm, 50mm and 85mm have extremely low breathing. Flares are very well controlled. They have a nice look but are quite subdued.

THE LOOK
They are sharp at any stop, and the image is very clean and free of distortion. However they color is just slightly warmer than neutral and I find it great for skin tones. Bokeh is really smooth and creamy, never busy. These lenses really make your subject pop from the background and give images a very 3 dimensional look.

CONCLUSION
These are high-end lenses, make no mistake. Also, neither the ARRI/Zeiss Master Primes or the Leica Summilux C primes will cover Full Frame, but the Sigma Primes will.
Sigma is a new name to the high-end cinema lens game, but once you try these lenses, they will be one of your go to sets of primes.