I haven't played much besides Cannon Defense this patch, however I went to Jimmy and used the Dutchmans Pestilence, Blade of the Abyss, and Mercer's Pistol to compare time to kill (from my own experience, no hard numbers here.) Mercers was my benchmark.
Blade of the Abyss: The bloodfire buff was very beneficial, it significantly increased the damage it does, bumping it up a tier or two in terms of how good it is. It did indeed feel like a legendary weapon for once. It took about 4 or 5 full sword combos (I use skip cleave,) to kill Jimmy, and pretty much one combo'd regular Tormenta enemies.
Dutchmans Pestilence: Even as a broadsword, it seems to be the best sword in the game now, even better than Leviathan in terms of time to kill at full bloodfire, which as noted, is very easy to maintain. This is most likely due to the critical boost insanely amplifying even weak sword moves with bloodfire. Consistently allowing 3 combos on Jimmy, it's much better than Abyss, as a famed weapon.
For contrast, Mercer, factoring out crits and using only full charge shots, takes 4 shots to kill Jimmy. With 1 crit, 3 full charge shots. I'm glad that sword is now viable when comparing to guns, because as most of us know, Beckett's and Mercer's were just the best in almost all situations, however Dutchmans Pestilence is just too good. I believe Fortune Burnrose hit a 30k bladestorm with it. Granted those were perfect conditions, including potions, doll curse, staff damage boost (I think,) critical hit, max bloodfire, however the point still stands.
I think that critical hit has to be changed in the way it interacts with bloodfire to balance out Dutchmans, that way Blade of the Abyss, as a legendary weapon won't suffer.