They may very well be at a slight difference in distance from subject, compounded by the lens differences. Its never a simple matter to get a camera comparison to be equal in all respects. This isnt trying to compare 50mm prime lens on the same test body after all.
The results are as you might expect. The nokia sony and samsung devices are more dedicated to camera performance and those companies have more expertise in that arena.
If we are lucky there will be some improvement to the camera from LG or rom tweaks, but in any case the g2 camera takes fine pictures for a smartphone. This review is what I expected based on specs and track records of the companies.