I've been looking for a Pentax 67, but then...

I have a Hasselblad and a Pentax 6x7. I have used the Pentax longer than the Hasselblad, both for professional work. You can handhold a Pentax 6x7 provided you have 400 ISO or more film loaded and are working in bright sunlight. I use the metered pentaprism and lenses shorter than 200 mm. Anything else, the camera goes on a Gitzo tripod.
Hasselblad, synonymous with the camera used by more professionals in the 1950s, 1960s, 1970s, and 1980s. Ansel used his Hasselblad for many of his famous shots. I would not recommend using a Hasselblad for street photography. It's not designed for quick snap photography. While I can handhold it, with a metered prism, fast film, and decent outdoor lighting, how many sports photographers do you see on the sidelines during a football game, using a Hasselblad?

For sports, political events, street riots, etc, a big RB would seem the most logical, especially if equipped with a long heavy tele lens and and especially durable strap, so you can swing it around like a Medieval spiked ball to defend yourself. A heavy tripod is fine too, as long as it's equipped with spiked feet.

dave olson said:

how many sports photographers do you see on the sidelines... using a Hasselblad

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OK, it's not football, but a great deal of Neil Leifer's iconic images were done with Hasselblad (and some serious strobe power).

In those circumstances, remote operated, motorised Hasselblads have the upper hand over a P67.