Changes to Melee only battles after update

The new melee (for the two people on earth who don't know) is Boxing gloves that grant crits for 5 seconds after a kill.

Now, in melee only mode, the new melee weapons are actually a downgrade (as you can't use uber or set people aflame) and aren't any more powerful than the melee weapons of the other classes.  This one looks completely superior to the old fists in terms of comparison to the old fists for straight up melee and better than everybody with possible expectation of the spy.  (maybe scouts if there are enough spies on one team).

I foresee heavy KGB/spy only fights in melee only matches after the update.  Do you guys think the same?  Or am I just being paranoid?

In a heavy vs heavy mele fight, the one with the normal gloves will win becasue of a greater rate of punches, statistically speaking.
A heavy's large amount of health puts him at an advantage to other classes in a mele fight, again, stastically speaking.
So I could definitley see the KGB being used more than the Ubersaw or Axestinguisher, but all it takes is one quick swinging heavy with the boxing gloves to take out a KGB clad heavy.

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And all it takes is one lucky crit to get the initial kill for a KGB heavy to wipe out the entire enemy team. As for heavy vs heavy fights, I don't think it will make that much of a difference, melee will still be who crits first wins.