Just having difficulty figuring out how the Sony CZ 24-70 scores low compared to these 3? Sharpness is higher than all 3, transmission is in line with both Canon and Nikon, distortion is at the top level along with the Tamron, vignetting it beats all 3, and CA is the same as the Canon (right between the other two). This should put is slightly in front of the pack, but then read about the 'blue bar range' for different FL - ok so here it seems about on par or maybe a little better than the Tamron and Nikon, but not as good as the Canon.
So how does it score a 21 when it exceeds certainly at the very least the Nikon (where it equals or beats it in all metrics) and the Nikon gets a 24 overall score? I know these are tested on different cameras, but how does that effect the weightings?