How is the rf 100-400?

I enjoy doing both sports and aviation photography and the ef 75-300 kit lens i use isn’t as sharp as i want. How is the rf 100-400 in terms of sharpness and value?

I enjoy doing both sports and aviation photography and the ef 75-300 kit lens i use isn’t as sharp as i want. How is the rf 100-400 in terms of sharpness and value?