Well, it is not just about lens correction like vignette etc. see below. Some raw converters like DXO and others link the lens to the camera, others do not it, like lightroom. In reviews / tests the raw converters which link the lens to the camera often achieve better results mainly in sharpness, color and noise reduction at high ISO. Negative consequence is, that raw processing time and the duration until modules are available, take longer.
FAQ ? DxO OpticsPro automatic corrections | www.dxo.com
"Why do DxO Optics Modules correspondent to a camera/lens combination instead of just to a lens?
As you can see from DxOMark measurements, a lens’s performance can vary greatly depending on the camera it’s mounted on, so correcting optical defects requires taking into account the specificities of each camera.
For example, the sharpness correction applied by an Optics Module is influenced by the sensor resolution, the presence or absence of a low-pass filter, the sensor’s noise characteristics, etc. It must also compensate for any possible corrections embedded in the camera, which is particularly true of JPEG files, for which corrections are often irreversibly applied."