It's also worth pointing out that when we are considering different focal lengths, the DOF and degree of background blur are not perfectly correlated when we shoot the same framing.
For example, let's suppose two lenses used for a shot with one framing. We use a 100mm lens at 10 feet and f/2.8 vs. a 200mm lens at 20 feet and f/2.8. In this scenario we will get the same subject framing and the same DOF at the subject. But the longer 200mm lens will render the background much, much blurrier.
As a general rule, if you have the working space to use and don't mind the distance, longer and slower lenses will pop subjects out from busy backgrounds much better than shorter, faster lenses.
Of course, we don't always have the space or want that perspective from the longer lens, so wider fast lenses are of course often useful. But when you are looking at telephoto lenses for this type of look it's sure helpful to understand how background blur is not simply a 1:1 relation to DOF. Long lenses will give huge blur with more DOF - and this look yields superlative 'pop' in bringing out the subject.