One of the things I keep meaning to drop into these discussions of great mics and their applicability in these contexts is that guys like Larry shop for basses with a certain sound in mind. I bought a bass from Larry once and had a conversation about this. I think he buys basses that are big sounding and loud but also, I don't know if there is a word for it but Mic'able. My little Contrabassetto is amp-able pickup-able, sounds frickin great with a pickup and decent with a mic blended in. But Larry's basses sound fantastic mic'd. Period. How they respond to a pickup is probably (even if he is sometimes forced to use one) not part of his equation. So his equation is 1. Bass that can make the sounds that he wants to mic 2. mic. 3. elevated powered full range speaker 4. no compromise. It is totally stellar to do. But not my world, I don't play on those stages, people talk when I play a lot, the drummers I play with are right next to me in a tight space (generally) they may still be in need of sensitivity training, electric piano (ugg) etc.
What I am saying is, that wonderful Larry mic sound that all of us love so much and envy and want, is not the mic by itself, it is the whole thing including the way he plays (check out in the SCO duo above or in the other thread how he uses his middle finger to walk so that he never inadvertently mutes the full resonance of his notes they last right up until the next attack ..killin)
Honestly I would just go out and sell a bunch of stuff and get the Damn MK41 and use it always but it ain't just the mic. That said there are a lot of great basses and players out there who could make this kind of setup work, but unfortunately few of us get to play on the concert stages (regularly) where this set up shines.
The quality of the bass is likely to be a huge factor. I have experimented with mics, but never found results satisfactory for live work. I played in loud environments with an amp. Too much bleed from the cymbals and too much interaction with the amp.
I think having a loud and powerful bass would be very helpful if you want to run a mic. The biggest problem with mic'ing an upright bass is the low acoustic volume the instrument puts out. The mic will pick up whatever sound reaches the capsule. If the sound of the cymbals is louder than the bass, there is very little you can do to fix the problem without degrading the sound of the bass. And it's not just the direct sound of the cymbals you need to worry about. The front panel of the bass is highly reflective so the sound from cymbals will hit the panel and bounce back into the front of the mic. This can create a effect that is sort of lick flanged cymbals...really nasty.
The sound coming from the amp can also cause problems. If the sound from the amp approaches the acoustic volume of the bass at the mic capsule, sound quality is degraded. Also if there is enough gain, a feedback loop can form between the amp and the mic. I believe a feedback loop can also form between the amp and the bass's body that tends to degrade the sound quality and change the decay characteristic of the notes. Having a loud and powerful bass should help with the first problem, but it may prove to be a liability with the second problem, but I think that may be more of factor when you are using a contact pickup.
The last bass I used professionally was 7/8 Lakeburg Baer. Another bassist had the instrument commissioned for the organization and it was a cannon acoustically. The bass seemed to have thin panels and was very resonant.
The same qualities that made the bass a powerful acoustic instrument made it challenging to amplify. I used one of the original Realist pickups at the time, and it worked pretty well on the previous bass I played. I probably should have tried a bridge mounted pickup on the Lakeburg Baer, because the tone with the Realist was overly resonant in the low mids and no amount of EQ could tame the problem.
I passed the Lakeburg Baer off to an extremely talented colleague. He went down the rabbit hole trying different pickups and also mics. He bought an AMT S25B, which sounded fabulous when he played solo. It was not possible to use much of the mic in his amp without getting feedback, and the bleed from the cymbals made the signal totally unusable IMHO. He tried blending the mic with various pickups using a D-Tar Solstice, but it was not long until he sold the mic.
Eventually my colleague and I moved to another band. He continued flipping pickups and eventually settled on the Ehrlund EAP. I tried his bass with this pickup and it was fabulous. I also mixed him on a couple tours and it sounded great. Definitely the best contact pickup I have ever heard.