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What Penrose proposes is highly speculative at best - there's no evidence for his hypothesis, even some serious evidence against it (starting with totally unlike scales of neural processing and quantum effects likely possible in the brain)
Besides, intelligence != conciousness; it's also not even really clear if the latter (together with free will) actually exists in the first place.
And nobody really argued above that brains and present computers are alike, quite the contrary - but they most likely ultimately can be, by the virtue of working in and exploiting the same physical reality.
BTW, in the last few decades tons of pseudoscience invokes quantum mechanics to support the ~"mystical" sphere / subjects.