Im not prepared to say that any one presentation would require more sensitivity than the next. But I will second WW2 when I say that a 400+ rod isn't required to acheive the sensitivity to catch a bass with a bottom contact presentation. Is there a difference between jig fishing with a Champ rod versus a Lightning Shock rod, certainly there is... But once you get to a certain level, I feel that comparing sensitivity is like splitting hairs. It kills me when I see guys comparing sensitivity in two rods that exceed the 350-400 mark. Like the threads comparing the Dx to the GLX, NRX, MegaBass, Legend Xtreme... At that point sensitivity is the last thing I would compare... Because they are all sensitive rods..they all will most certainly aid on catching fish.
Little bit of a rant that got off track.. sometimes I really think that sensitivity is over rated. ( is say that, but I am spoiled by Powell and a new Dx). There are few things that will aid in sensitivity and will result in more fish for bottom contact presentations, whether you are fishing a Vengeance Rod or a NRX.
Correct line selection - braid is great and helps a ton for sensitivity, but if you are using slack like presentations that require the lure to freefall, I prefer a floro
Tungsten weights- more dense
Paying attention - focusing ans mentally pictuing what your are feeling as you hop a jig or pull a lure through grass will result in more bites DETECTED.
EXPERIENCE- this one is huge, the more a guy practices, focuses, and fishes the more cognizant he is going to be to detecting bites in what ever water or cover.
Sorry for the long rant