Anyone seen benchmarks comparing Gemma 4 4-bit QAT vs. 8-bit standard quants?

I'm trying to find out if anyone has done any benchmarking comparing the Gemma 4 4-bit QAT models (via Unsloth) against standard 8-bit non-QAT quants. I know QAT is supposed to retain a ton of accuracy compared to the baseline BF16, but I'm curious how a 4-bit QAT model actually fares against a trad