A very competent upgrade, but one that comes at a fairly heavy cost.
Autofocus Contrast Detection AF system with 169 AF points // Image Quality Up to 14-bit uncompressed RAW // LCD Monitor Tiltable 3.0inch TFT // Electronic Viewfinder XGA OLED // ISO ISO 100 – 102,400 (expandable to 50 - 4,096,000) // Storage 1x SD card // Connectivity 1x 3.5mm audio, 1x 3.5mm microphone, 1x Micro-USB, 1x Multi interface shoe, 1x Micro-HDMI, Wi-Fi, NFC // Dimensions 126.9 (W) x 95.7 (H) x 60.3 (D) mm // Weight Approx. 584g (body only) // Warranty 1-year // Contact Sony Customer Interaction Center // Telephone 1 800 88 1233 // URL www.sony.com.my to record full 4K video, the A7S II can now perform this function internally, recording 3,840 x 2,160 pixel resolution movies at a maximum of 100Mbps. No pixel binning is used with the A7S II for the 4K capture, so you actually get footage with less moire and jaggies.
On the stills side, whatever Sony has done with the camera has certainly improved the low-light performance too. Whereas images taken from the original would exhibit plenty of color noise from ISO 6,400 onwards, the new camera now largely eliminates it throughout the entire ISO range. In place of this though, you get noticeable smudging that kicks in at about ISO 25,600.
As you might expect, that's about the limit at which we'd recommend you use the camera, but we have to say that you can probably use images taken at ISO 51,200 for prints with a bit of work in post. That's again much higher than what you might be able to do with any other camera in the market at the moment, and is a good sign of how this new model has raised the bar.
Unfortunately, this all comes at a pretty heavy cost. Where the A7S retailed for RM8,479, the A7S II comes with quite a marked increase to RM13,499! And that's again the body only option, which means you can expect to be forking out close to RM18,000 for a working system if you're new to Sony.
If you're looking for a professional camera with good low-light capabilities just for stills, we'd give the A7R II real consideration instead, or perhaps even the original A7S, which is now being discounted to a street price of about RM7,200. However, if you're looking to use the camera mainly for video, then the two stop advantage you gain plus the advantage of the 5-axis stabilization is certainly invaluable when you don't have the advantage of using a longer exposure interval to allow for lower ISOs.
Ultimately, if you must have the best in low-light capture for video and photography, then the A7S II is your bet. by