High ISO RAW Test of Sony A77 II camera done by french website focus-numerique, you can download the high resolution sample images from here.
visible image noise actually starts from ISO 3200, Both Sony A77 II and Canon 70D showing excellent image quality but Nikon D7100 and Pentax K-3 is showing bit high amount of noise compared to Canon or Sony.
Again at ISO 6400 the Sony A77 II and Canon 70D is showing bit less amount of noise compared to Nikon D7100 and Pentax K-3,
Based on the image quality test I recommend you to go for Canon 70D, Since Canon 70D sensor is also unique since it features Dual AF pixel Auto Focus Technology that comes with hybrid photodiodes inside, it help Canon 70D to quickly acquire AF during Still or video shooting + you also get a wide range of Canon high quality lenses and on the other side we have Sony A77 II SLT camera, the camera is a perfect choice for photographers those who need image quality + high speed AF performance.
Buy A77 II from Amazon || B&H || Adorama || Canon 70D at Amazon | B&H |