The Sony 70-300mm has an average review score of 77.7%

Score (%):
Sony 70-300mm F4.5-5.6 G SSM Interchangeable Lens Review
I can't help but have mixed feelings about this lens. It's built superbly, is fast focusing and has great control of falloff, distortion and flare. At shorter focal lengths it also performs very well, but to get good results at 300mm, the lens needs stopping down.
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70

Sony 70-300mm f/4.5-5.6 SSM G (SAL-70300G)
The Sony 70-300mm f/4.5-5.6 SSM G impressed during our APS-C format test and it is capable of delivering high quality results within the full format scope as well. The resolution figures are generally excellent at 70mm and still very high towards the long end although the border and corner performance drops somewhat more here.
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73

Sony 70-300mm f/4.5-5.6G SAL-70300G
This lens produced some really sharp photos even wide open. However if shooting in any condition except bright sunlight, maximum aperture is too small for anything. Color a bit on the warm side.
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90