>>44997953It makes a surprising difference once you factor in choice specs/band.
Example:
252+ SpA Choice Specs Aegislash-Blade Shadow Ball vs. 252 HP / 228+ SpD Corviknight: 186-220 (46.5 - 55%) -- 10.9% chance to 2HKO after Leftovers recovery
252+ SpA Choice Specs Aegislash-Blade Shadow Ball vs. 252 HP / 228+ SpD Corviknight: 195-231 (48.7 - 57.7%) -- 52.3% chance to 2HKO after Leftovers recovery
The difference of 10 spa makes you hit about 5% harder, which can be noticeable.
You have to factor in the king shield nerf too.