>>4130384MFT loses on price and image quality (prime 800mm f/6.3 vs zoom 800mm f/9), and all you gain is more flexibility with the zoom/TC. You're only saving 600g and a bit of bulk, but when you're already carrying something as large as the 150-400, those are fairly negligible. You're also buying into a mostly dead system vs a system that is growing quickly. And of course
>$10K>m4/3