Given that they tweaked the way reflection works, and you can specify different resolution for captures now, it MAY be that the default capture size changed, and if that’s the case, it MAY be that the values they had for calculating a reflection map MIP level bias based on roughness aren’t updated to match. If that’s the case, content will look less rough than previously, and the fix would be to select a smaller reflection capture size in sphere map settings.
Can you try that and see how it goes?