QF8 (38.1 dB) vs FP8 E4M3 (31.5 dB) on N(0,1) — a 4.6× reduction in quantization noise power. The advantage is consistent (+6.3 to +6.8 dB) across Gaussian, log-normal, Laplace, and 90%-sparse distributions, and across matrix sizes from 16×32×16 to 128×256×128. This is structural: 16 vs. 8 levels per octave.
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