I currently have the 500 mm PF lens as well as the 70-200 Nikon Z lens. These are the only long lenses I have at the current time. I don’t really know what to expect from Nikon regarding the 200 to 600 mm lens or for that matter the 800 mm prime on the road map. I absolutely love the 500 mm PF lens and it’s really great with the 1.4 teleconverter. The only unfortunate part of that is you’re all the way down to F8 with a teleconverter which is definitely not ideal for low light conditions. This is certainly one area where Sony has the advantage at this point by offering the 200 to 600 mm lens. I cannot support a 600 mm F4 lens and not even sure I could support it on a tripod carrying it for that matter. I’ve been looking in the used market at the 500 mm F/4 lenses. again this is a fairly substantial lens as far as weight and size but I would have a 5.6 500 mm lens with the teleconverter. They still are fairly expensive even used at this point and are definitely a phenomenal lens. I’m just wondering if I should go this route or just wait on the Nikon to come out with a longer lens? I am pretty certain that either the 800 mm prime or 600 mm prime for the Z system is going to be substantially more than a used 500 mm f/4. If I did go this route, I would definitely keep the 500 mm PF for a lightweight handheld lens. This is definitely what made the decision to send the Sony A1 and the 200-600 mm lens back so hard. I’m sure there are others that are having the same dilemma with what to do for a longer lens I would just like to get some thoughts from the members on here of what would possibly be the best route to go.