How much of a difference will new shoes make?

I'm starting to climb 5.11+ and still wearing my evolve defy's that I bought God knows when. They used to hurt my feet but now they fit like slippers and I feel like I never have to take them off. When my feet get sweaty the sole also tends to roll a bit while edging.

Anywhere between some, a lot or potentially nothing.  But I would say realistically it will help. 

If you get a pair of shoes that fit well and are appropriate to the type of climbing you are doing you will get $75 worth of difference.
If they don't fit well, but are appropriate to your type of climbing, you will get somewhere between -$20 to $45 of difference.
If they are not the appropriate style of shoe to your climbing, but fit well, you will get somewhere between $0 to $30 of difference.
If they don't fit well and are not the appropriate style of shoe for your climbing you really screwed up and wasted your money.
I love/hate getting new shoes.

Stop letting your feet get so sweaty. That's gross.

I'd say it depends on what type of climbing and what is holding you back. If you're climbing 11+ outside with techy footwork, you might be in for a pleasant surprise. If you're climbing 11+ splitters at the Creek, you already have a great tool for the job. I want to believe that gear doesn't matter that much, but in some cases it's a huge advantage to have good shoes! 

Climbing shoes are aid. 

If you ever climbed much barefoot which I have you know shoes are aid & I'm not climbing without them.

Lmao you guys climb barefoot? Feet are aid. Real climbers only use their hands, as God intended.

edgeskier2017 wrote: I'm starting to climb 5.11+ and still wearing my evolve defy's that I bought God knows when. They used to hurt my feet but now they fit like slippers and I feel like I never have to take them off. When my feet get sweaty the sole also tends to roll a bit while edging.

I switched from tightly fitting moderately high performance shoes to comfortable cheap and low performance shoes and noticed almost no difference whatsoever. I climb about the same grades as you

Nobody can know how much difference it will make for you.   Largely depends on how good your footwork is and what you climb.

Personally I blew out the toes in all my good bouldering shoes and grabbed an old pair of evolve trad shoes from before I got tcs.  They sucked so much and made frustrated so I just climbed in shoes with holes all the way through the leather until my new shoes  came.

Climbing shoes make a ridiculous amount of difference and anyone who says otherwise is lying to you.  A good climber can make use of a wide range of shoes, but they can always climb better in the right shoes.

Mind you the “right shoes” are not necessarily downturned aggressive shoes for every climb.

As all have said, it’s hard to say what the ultimate difference will be to you personally, but while never comfortable, a great pair of shoes will often be the difference maker.....
Sometimes between going home and getting laid.  Choose carefully 

Support the crippled economy. Buy another pair of shoes. 

edgeskier2017 wrote: Lmao you guys climb barefoot? Feet are aid. Real climbers only use their hands, as God intended.

Johnny Dawes disagrees:

https://www.youtube.com/watch?v=gB-makVoIPU

For me it’s mental, when I trust my shoes will stick I climb better. They likely do start making an actual difference when you get into the 12s or so but if you climb better in better shoes who can argue that you shouldn’t?