More solid, better button
I have a few other adapters and they are all OK but this one is the best. The Fotga is fits fine and is quite functional but the K&F seems a bit more solid. But what really sets the K&F apart is its larger release button which is easier and more comfortable to use. Honestly, it kind of hurts my finger to push the release on the Fotga and my Fotodiox. I'll occasionally still use the Fotodiox when I need an adapter with tripod mount but the K&F is my fav. I recently picked up a Leica lens and needed and adapter. No question, I ordered the K&F.Note on the picture: I'm holding the FOTGA and the K&F is on the camera. You can compare the release buttons.