Had the D3400 set up on the monopod with the new 200-500 and a female cardinal was in the crepe myrtle tree out front. This was after a rain shower and it was nice and soft lighting, although I would have liked to have a little more light to bring up the shutter speed without resorting to a higher ASA on a crop frame camera. I didn't swap over to the full frame Z5 in the interest of possibly having the bird leave while taking the time to swap everything over, and having the extra effective length with crop frame.
Not drop dead sharp, but not too bad considering the shutter speeds.
I really like the mood of this one. I was in a hurry to get the first couple shots in case the bird flew off, and had it in manual and exposure was a couple stops underexposed. I pushed it in Lightroom about a stop and a half and it came out fine.