Here's a look at the 'brightness' of comets in recent history (Negative = Brighter)
Brightest comets in the last two-thirds century
Here's how the magnitude scale works.
The astronomical magnitude scale
Considering they are estimating the magnitude of this comet to be as bright if not brighter than the moon (-13 Magnitude) I would definitely consider this to be a once-in-a-lifetime event.
I remember Hale-bopp in the 90s... that was pretty darn cool. This one looks to knock the socks off that one in terms of brightness.
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