Nah, I still use the Nikons. Just used the D6 last week to get the image below (mostly because I needed a 70-200 2.8 to do it though and I don't have one for Sony yet - still the D6's low light capabilities were an asset). Still, yes at the moment the a1 is my favorite, it solves a lot of problems I've had over the years and can keep up with what I need it to (not always the case with Nikon, even the D6 would sometimes not keep up with me LOL). I'm still hoping for a Z9 that's a tteh same level however - I like Nikon better overall. Right now, it just can't keep pace with the Sony for the really tough stuff.
Oh, also keep in mind I'm trying to learn the Sony system and that means it needs to be in my hands most of the time