I don't know how you get away with only shooting 800ISO with wildlife, keeping the shutter speed at 1/1000 on an overcast day requires 1250+ in my experience. If you are in a darker environment like a forrest or under cover 3200+ is where you need to be.
I would never use ISO 3200 for wildlife on a crop camera. You might be able to get away with it for indoor sports, but it's not going to cut it for antler and fur detail in RAW. The shots I've taken at 3200 are strictly for memories (wild bobcats, grizzly bears).
ISO 800 is about the limit of my friends usage on crop as well. I do dip into ISO 1600 from time to time, but these need major work to restore fur and antler detail.
If you are routinely using ISO 3200 on a crop camera for wildlife, you need to consider moving to FF ASAP, because that's shooting a weakness.
Thats why I shoot FF… Which is why I said i don't know how people get away with only shooting ISO800.
Yep. I consider crops "afternoon" wildlife ISO 100-800 cameras, and FF for crepuscular/forest shooting to 12,800. Different tools for different jobs.
The crop bring you closer in daylight when animals are more leery, and the FF gets the job done in lowlight hours when many animals are more active and willing to move closer.