Replying to I need help from GH4 and full frame owners

Okay, I have a GH3, and lately I have been wanting to sell my camera and upgrade. I miss the canon lenses, and I've been wanting to go back and full frame has been on my mind. As far as I knew, I thought I wanted to go to the full frame 6D, and start buying Canon lenses.

But today, I'm thinking about considering keeping my GH3 but with a Metabones speed booster and a Canon EF lens. I read that it reduces the crop factor, but is it really that much better? I couldn't stand the crop factor on my GH3, and I really want to know if it's worth it.

I also miss the photo capabilities of Canon cameras, I've never been super happy with using the GH3 for photos, but do you think this would change much with the addition of a speed booster and Canon glass?

So, what's your advice? Stay on the 4/3s train and invest in a speed booster and buy Canon glass or go full frame and buy Canon glass?

Thanks for listening guys, any advice would be awesome!

Also, my budget is about $1,400