I had hoped that the review would be a point comparison between the 420 and the 520. It was disappointing that only the grip and the IS system were noted as differences. I would have liked some comment about weight, battery consumption, price etc. It would not have been unreasonable to expect some comment about other similar cameras such as the Panasonic G1 for example. Your reviewer does not have a clear speaking voice and I thought he spoke to quickly - so I had to replay a few times to understand some of what he said. GjR