Comparison is indeed healthy (like what most people stated) as it addresses the grey areas that the other party is superior to. Although Bitcoin is a decentralized system as compared to Visa, Paypal, etc. who is centralized in nature, both appear to be mediums in-exchange for products/services digitally.
No matter what the comparison may be, we should not stray away from the fact that Bitcoin has its own revolutionary platform that no other payment method can match. The only hindrance in achieving its potential are its legal status and acceptance of the government. But these are factors that will soon be addressed in the near future.
Comparing something that people see as new and an existing innovation is an advantage to that which is new innovation, meaning the new has written a name in the annals of history.
Certainly it is bitcoin which is new among the chronology that you have listed that means bitcoin has really grown in these few years. I would say it is an achievement worth comparing.
I am pretty sure when Visa or paypal was introduced, it received the same attention and comparison from the same existing payment platform. The emergence of bitcoin and its comparison to others is inevitable and should be treated as an advantage in order to know its positive and negative implications.