What are the key differences between the Canon 5D Mark III and the Sony A7S in terms of performance and features, and which one would be a better choice for professional photography and videography?

The Canon 5D Mark III has a higher resolution sensor and better autofocus system compared to the Sony A7S. However, the Sony A7S has better low-light performance and 4K video recording capabilities. For professional Photography, the Canon 5D Mark III may be a better choice due to its higher resolution and autofocus system. For videography, the Sony A7S may be preferred for its low-light performance and 4K video recording. Ultimately, the choice between the two depends on the specific needs of the photographer or videographer.