Kars vs Sapphire: who would win?

Kars favored — Slight edge (~55%)

Kars · JoJo's Bizarre Adventure · Ultimate Lifeform

Tier

8-A

Attack Potency

Multi-City Block Level+

Speed

Massively Ftl

Durability

Multi-City Block Level+

Sapphire · Steven Universe · Base

Tier

8-A, up to LOW 7-B

Attack Potency

Multi-City Block Level, up to Small City Level

Speed

Relativistic

Durability

Multi-City Block Level

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