Kanna Hijiri vs Gilthunder: who would win?

Gilthunder favored — Slight edge (~55%)

Kanna Hijiri · Puella Magi Verse · Hyades Daybreak

Tier

6-C, up to 5-C

Attack Potency

Island Level, up to Moon Level

Speed

Massively Hypersonic, up to Massively Hypersonic+

Durability

City Level, up to Moon Level

Gilthunder · Nanatsu no Taizai · Post-Druid Training

Tier

6-C

Attack Potency

Island Level

Speed

Sub-Relativistic

Durability

Large Mountain Level

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.