Review
Whereas the A7R II targeted landscape photographers with its huge 42 megapixel resolution and the A7S II clearly appealed to videographers, the Sony A9's sheer speed makes it a serious rival to the Canon EOS-1D X Mark II and Nikon D5, two well-established cameras that have long dominated the sports/action segment of the professional market. The fact that the A9 out-performs both of those cameras in certain ways is testament to how far Sony have come in a very short space of time.
Samples
Please sign the petition to get Sony to fix the star-eater issue in A7Sii and other A7 models: https://www.change.org/p/sony-remove-the-star-eater-on-sony-a7s-r-mk-i-ii-and-a9-cameras
Sony Alpha a9 Mirrorless Interchangeable Lens Digital Camera Body Only + 50mm & 85mm f1.4 Dual Rokinon Prime Lens Bundle for $4498
https://www.amazon.com/Mirrorless-Interchangeable-Digital-Camera-Rokinon/dp/B073VJS9H2/
Another bundle deal with 128GB+32GB SDHC Sandisk cards
Review
The α9 supports full pixel readout without pixel binning for both UHD 4K and Full HD 1080p movies and also includes the Slow & Quick Motion modes, introduced in the α6500 (INSERT LINK), which let users choose from eight frame rates between one and 100 frames/second (fps) to create speeded-up motion or slow-motion movies in the camera.
Three video codecs are supported: the proprietary XAVC S (for 4K and high bit rate FHD recordings) plus the regular AVCHD and MP4 formats. Frames are cropped slightly in the 4K recordings but not with the others. The Slow and Quick Motion modes record at a resolution of 1920 x 1080p and support frame rates of 1fps, 2fps, 3fps, 6fps, 12fps, 25fps, 50fps or 100fps. Playback can be selected from 25 fps or 50 fps.
The picture profile settings provided in the α7S II don't seem to be included in the α9. Nor is the S-LOG profile, which is strange. The closest option is the Neutral setting in the Creative Style menu. 4K video is recorded with 8-bit depth and 4:2:2 colour subsampling, which is pretty standard for a high-end 'pro-sumer' camera.
http://www.photoreview.com.au/reviews/advanced-compact-cameras/interchangeable-lens/sony-α9-ilce-9
The above review says "4K video is recorded with 8-bit depth and 4:2:2 colour subsampling, which is pretty standard for a high-end 'pro-sumer' camera." This is misleading (or the A9 is a big Sony exception): only 4:2:0 is recorded internally, "which is pretty standard for a high-end 'pro-sumer' camera." What is also "pretty standard for a high-end 'pro-sumer' camera" is outputting 4K 8bit 4:2:2 video.
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