And some wildlife.
First I tried to get a comparison with geese but ended up with ducks.
The duplicate picture of the duck has a tiny bit of extra colour saturation, I think it helps with white balance and makes the image much more natural.
EDIT: Images off the Samyang are ISO 400 pushed almost one stop (+0.83) in post, so it's really more like ISO 800. the Canon 400f5.6 image is bumped up by +0.17.
Samyang 800f8 1/1500 ISO400
This is probably from the same position, but there might be a differece of a few meters.
Canon 400f5.6 1/1500 ISO400
There's a pair of hawks nesting on the home quarter and they screech at me almost the entire time I go for a walk in the back pasture.
Yesterday I barely managed to snap this through the trees (no leaves yet), the bird was obviously uncomfortable being this close.
My hit rate with BIF using the Samyang 800f8 is about 1 in 20. Racking focus is the only way I've managed decent shots regardless of whether I'm on my belly or standing, though I don't have much practice.
I just did a bit of extra noise correction and the same colour correction as with the duck above. My default sharpening is "off" but I doubt it would make much difference at this level of detail.
It's not much but everything considered even getting a thumbnail quality image feels like an accomplishment.
Samyang 800f8 1/2000 ISO 800