Price is comparable so in theory the hybrid offers the better performance? Ferrari used the hybrid extensively in the F40, why is it that supercar builders these days use pure carbon, even when the panel is to be painted?

The theory does seem to differ somewhat from the experience I have with composites and impacts, and I would wager that is due to the high energy point losing that is involved with stopping bullets and projectiles. My experience is mainly in the mining sector, I was involved in a project making carbon fibre haul pack trays. The impact loading is somewhat different, very large and heavy rocks and debris being dropped onto the tray. The theory here is that a composite laminates ability to resist an impact is it's resistance to deflection. The brittleness of carbon fibre comes from the fact that it has extremely poor elastic performance, so any failure is catastrophic. In order to resist failure, the laminate needs to be able to take the load without deflecting past its plastic loading capacity. Hence, stiffness is key and carbon fibre is the best material for it. In this situation, Kevlar is a poor choice due to its very poor compression properties, and there is no use for its higher elastic performance in a hail pack tray.