The Holy Diver sounds nothing like a modern JB. But it does sound remarkably like the original JB, back when it had 13-14k resistance and no engraving on the base plate. I'm talking the ORIGINAL JB, which is a great pickup. The new JB is sonic mess in my opinion.
I don't think the HD will add 'sparkle' to your guitar, but it will sound a lot more even, not the boom n sizzle of the modern JB. It will also respond a lot better to your amp's EQ and will have a TONNE more definition.