Its rare that a car comes after the originator and just kills it but that Kia Soul did just that....They nailed the car and the marketing.....I can't remember the last time I've seen any advertising for the xB.....
What they really nailed was the Soul's price....at least at first. My brother bought one in 2010, with the Exclaim (!) package, for somewhere between 17 and 18K (don't remember exactly). That version came with not only more and nicer equipment than the base model, but also included the 10/100 and 5/60 warranties. At the time, it significantly undercut the xB's price, and the fact that all xBs, because of Scion's sales-policy, sold for full-list, while you could bargain on a Kia product.
However, both Kia and Hyundai prices have gone up significantly in the last few years, and the Soul, today, though much-improved in refinement and road-manners over the original versions, is not quite the bargain it once was. Still, it outsells the xB (from the figures I've seen ) some five to one.