Sarah from Kershaw's customer service told me:
"Thank you for your interest in our knives! The Sandvik 14C28N has a RC of 58-60 and the S30V is 57-59."
In all honesty, I'd rather have 14C28N than S30V.
Tell you what. I'll send you two Blurs. Both have black handles, both are pretty new, both have satin blades, and both are sharpened to 20 degrees. One is 14C28N, and one is S30V. The S30V one is marked as such on the blade. Use them. A month after receiving them, decide which one you prefer. Keep it. Then send me the other one back.
"Thank you for your interest in our knives! The Sandvik 14C28N has a RC of 58-60 and the S30V is 57-59."
In all honesty, I'd rather have 14C28N than S30V.
Tell you what. I'll send you two Blurs. Both have black handles, both are pretty new, both have satin blades, and both are sharpened to 20 degrees. One is 14C28N, and one is S30V. The S30V one is marked as such on the blade. Use them. A month after receiving them, decide which one you prefer. Keep it. Then send me the other one back.