I bought the DJI FPV drone last year - first FPV I ever had. I love the motion controller, btw.

This year I bought 4 FPV drones to go with my DJI goggles. Three ready to fly and one scratch built. 

I had Nano cameras in 2 of them and changed them to Nebula Pro Nano with the Caddx Vista.

Today I flew my DJI FPV drone for the first time this year and was amazed how much better the image quality was in the goggles. No blurring of the grass or trees, just good clear video for all four flights. 

Is there a better camera I can buy to get my FPV drone video to look like the DJI?

I am not DJI FPV owner or expert.

But my understanding is that the DJI FPV drone uses a 2.4Ghz + 5.8Ghz link that is better. Its why it requires the v2 goggles.

It’s possibly an antenna/signal issue. When DJI get low signal it blurs parts of the image, generally everything outside the center is the image.

So maybe if you had better antennas or better positioned antennas it could help.

I guess the first question would actually be: Do the images look the same when not flying? Or do they look noticeably different?