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Dynamic contrast of V10 is 100,000:1, whereas G15 is 50,000:1.
G15 seems to have more input options than the V10.
V10 can do picture-in-picture, G15 can't.
Small difference in dimensions and weights of the sets.
Other than that I don;t see much difference between the two on using the Panasonic website 'compare' facility. I have the G15 myself and love it!