Reaching for Another 50mm: 50mm f/1.4 AI-S

The 50mm 'standard' lens was the 'kit' lens of yesteryear but that didn't mean that they were poor quality. In recent times, the 'basic' Nikkor 50mm was the very affordable and highly competent 1.8D but how does this compare to it's older uncle, the 50mm f/1.4 AI-S?