Got to say a few things.
There are 2 causes for sibilance, the production or the reproduction of the recording. In the production, closely mike'd vocals and studio compression are the causes of sibilance and cannot be controlled without de-essing in the mix or using a different miking technique. Thousands of recordings are already embedded with it to one degree or another.
Preventing it FURTHER while using vinyl means a stylus profile and high frequency tracking of high order. When set up correctly you will then be in a safe zone where you may notice it on the recording, but without any further emphasis (mistracking). Grado's, unfortunately, are not known for this. This can be realized by simply looking at the numbers - check the high frequency tracking ability, the higher the better.
When it comes to digital, the sibilance on the recording usually reveals itself by instantly jumping forward out of the normal spatial mix perspective. The lengthy explanation for this phenomenom is on the web.
And, of course, make sure your listening environment and equipment are not adding emphasis - speakers that are "bright in the highs" are NOT "very accurate".