PinchBench results for Qwen3.5 27B using
@UnslothAI K_XL quants, best of 3, thinking enabled.
TL;DR: Q3 KXL (14.5GB) or Q4 KXL (18GB)
While overall the "best" results showed little degradation, if you dig into mean/std Q4_K_XL overall was the best at ~84% on average.
Q3 seems viable, while Q2 is the the lowest performing, of course.