Is a $2,899 Lens Much Better Than a $649 Lens?

One would think that a more expensive lens would outdo a cheaper lens. I mean, for the most part, that's absolutely true. There are lots of big factors to take into consideration with lenses. There's autofocus, image quality, weather sealing, and other tech. But we were curious to see whether the Canon RF 100-500mm L majorly outdoes the much cheaper Canon RF 100-400mm lens. We've reviewed both, so we put together this short, informal comparison for you.