These bitmap sectors also have to be skipped over when reading consecutive clusters from a drive image - more seeks. Every time you modify a sector inside a block these bitmap blocks may need to be updated and written too, involving extra seeks, reads and writes. The reason is that the dynamic VHD format has these "bitmap" sectors scattered throughout the disk. Having recently studied the VHD format, I would expect there to be at least a small difference in VDIs favor, most noticeable when you are comparing like with like, i.e. Mpack, explains a key performance difference between VHD and VDI here: Performance is always slower than running an operating system on the host because of the virtualization overhead.
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