How much difference will a phono stage upgrade make?


For the past couple of years I’ve slowly been upgrading my audio equipment. I currently have a Primaluna Dialogue Premium HP integrated amplifier, an EAT C-Sharp TT with an Ortofon Quintet Black MC cartridge, and Tannoy Revolution XT 8F speakers. The weak link at this point, it would seem, is my phono stage, which is a Pro-Ject Tube Box DS. All things considered, my system sounds really good to my ears, but I can’t help but wonder what a phono stage upgrade would bring to the table. I’m looking at the Manley Chinook Special Edition MK II, which is a big step up in terms of cost, but I wonder how much better it will actually sound. Has anybody made a similar upgrade, and was there a marked uptick in sound quality?
12hz
Allnic H-1201 might be better than Manley, ideally you would want to compare before choosing. Used H-1201 should be $1500 or less. It comes with NOS Mullard tubes and you can get replacement from the factory. Not that some other NOS tubes cannot sound better.
I started with a Pro-Ject Tube box and was pleasantly surprised at the improvement. Then I replaced that with Simaudio's Moon 310LP and 320S combo. Wow, that was a difference! The staging is incredible and the sound very well rounded. 
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@12hz,   Yes you have great options to be excited about.  I really cannot comment on stuff I haven't heard and all of it you are getting recs for is solid by reputation.  

All I can say is my Chinook is superlative.  I adore it.  It sits quietly in the rack doing more work, so to speak, than any other element of my system. Great speakers? Check. Great amps? Check.  The Chinook makes them all shine.  The sound is big and fat, fat, fat, fat.  It's sooo smooth.  

I grew up listening to vinyl through my folks.  They are older now and heard it.  They were floored at how clear it is. The gain is stellar.  You cannot go wrong. 

I often think about upgrading stuff.  I'd be spending $6-$10k on speakers and still not swapping out the Chinook.  You sort of know what you know after doing this awhile.  I know the Chinook might be my strongest link.    

I run MC now, but the Chinook was vintagely (not a word) captivating with the Ortofon 2M Black.  I think the Chinook is out of its league but, still, it was intoxicating. 

I'd love to hear a Herron though.  Can't lie.