The G lens only excels at one paramter (sharpness, acutance to be more specific) and only at one aperture, the widest f/2.8 aperture to be more specific. On the most of the rest of the parameters the G lens performs significantly worse. CA worths specific mention in this regard despite the ED element in the G lens.
SO HOW COME DO THEY SCORE SAME?
(Note: If this were a lens where the most important aspect were high performance at maximum aperture, this could have been the explanation, but even the review explicitly states that performing high at f/2.8 is not what people look for on macro lenses. I'd like to also remind that when closed focused the aperture will be automatically stopped down.)