An impressive place to seek info is at Cal's site, PrecisionRifleBlog.com. I find his "DATA-DRIVEN Approach to Precision Rifles, Optics & Gear" quite informative, and it might help with your decision.
Tactical Scopes: Field Test Overview & Rifle Scope Line-Up | PrecisionRifleBlog.com
I cannot speak about the Conquest HD5, but all of the Zeiss Victory line of optics beats every high-end Leupold scope I have used. Clarity, crispness and low-light light transmission is far better with the Zeiss Victory line. I have been tempted to find a Conquest HD so I can compare it to my...