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most fast lenses exhibit a certain level of chromatic abberations when shot wide-open or near wide-open, but the more expensive ones usually handle that aspect a little better than the cheaper ones, i.e. the 50/1.8.
From my experience with using Nikon's 35/2, 50/1.8, and 50/1.4, the latter two are identical when shot wide-open, but the 1.4 version cleans up nicely when stopped down to f2 and beyond, whereas the 1.8 has to go down to f2.8 or so to make it CA-free.
So it's not that the 50/1.8 is bad, it's just bad when shot wide-open in high contrast areas. More expensive primes handle that better, that's all.
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Nikonian
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