Examine this circuit; each of the diffpairs has gain of 8X at low frequencies; but their F3dB (45 degree point) are not consistent; why?

<!-- Begin schematic: In order to preserve an editable schematic, please
     don't edit this section directly.
     Click the "edit" link below the image in the preview instead. -->

![schematic](https://i.sstatic.net/MKO7E.png)

And Q7/8 do not have gain of 8X. Why?

<!-- End schematic -->