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At 435x, B did look a bit smudgey to me also. My half-baked theory for this is that with both A and B being point sources, their airy disks are actually the same size (notwithstanding any differences due to their different spectra), so once you're well into magnifying the airy disk (as is the case at extreme powers), it must follow that the disk gets dimmer, with B's being much fainter than A's but a similar angular size. That alone might partly explain some of its appearance. The other thing is its apparent interaction with A's diffraction rings, which could make it appear elongated or otherwise distorted, particularly when B's own diffraction rings interfere.
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