Interesting example Michael. Given that good looking light, I would have shot that at ISO 800 instead of 1600!!
I run into too many shooters in the field, trying for birds-in-flight and getting disappointing results because the won't raise their ISOs to get shutter speeds up in the 1/1000-range. Many of them are holding onto an old "keep the ISO low" mantra that's holding them back unnecessarily. To maximize IQ, I also think that it's important to ETTR (expose to the right).
Dave