I have only had Batch #41 so my reference in trying to find you something similar may be completely different due to the fact that every batch of a'bunadh is different.
But the batch that I had was a heavily sherried whisky with a hint of sulphuric tones in the background.
It was, in a word, amazing.
The only whiskies I could think of coming even remotely close in nose and palate would be Macallan 12 year aged in sherry casks from Jerez, Spain and Glenfarclas (most ages). Most "sherry bombs," in fact.
However nothing will ever really be the same as a'bunadh, it's just too unique. It is made from many different barrels of Aberlour whisky, of varying ages. No one knows exactly what ages it contains, but one assumption I have heard is casks from 5-35 years old. This gives it such a unique taste and helps the company save some money while not having to put an age on the bottle. A few companies are starting to do this these days due to increased demand, exhaustion of vintage casks and a surplus of young casks from the 1990s when whisky started to explode and they were like "woah, we gotta catch up!" Glenrothes "Select Reserve" is another example, but from what I understand it wouldn't be similar to a'bunadh at all.