I can't say this for everybody, but if you like the soul series in specific, now would be the time I'd recommend getting a PS4. Its no secret that my friend got the PS4 for me as a gift a year ago, but my plan was always to pick it up once Bloodborne or Uncharted came out. Now would have been that time.
And while I can't say Bloodborne is better than the Souls series as it is not only too early for me to judge that, but they play differently as well. While both are very similar, Bloodborne is a much faster paced game and emphasizes dodging over using a shield. Though many Soul veterans were already use to this playstyle with quicker characters in the soul series, Bloodborne is pushing you directly into this approach. This is the main seperation from the two games which I will judge more later on once i put more time into it.
What I will say is that Bloodborne has lived up to my expecations and that it alone makes the PS4 worth the price and investment if you're a souls fan. Personally i wouldnt mind seeing a Bloodborne bundle.