Will I Hear A Difference?

As far as...will you hear a difference...

The phono signal can be 1000x smaller than a line level signal.

It does help to have the best TT, cartridge, headshell leads, interconnects, phono pre you can afford.

flasd: To respond directly to your question about the EAT b-sharp, I will first say that all that glitters is not gold. I do NOT have first hand experience with the b but I DO have first hand experience with the C-Major. I hope that my experience is close enough to help. I'm sure by now you know the history of the EAT brand. In my estimation EAT turntables are Pro-Jects with a woman's touch, which ain't always a bad thing but here it is. It actually sounded pretty good and had decent reviews. Unfortunately that's where it ended. My first issue is that EAT's are not accurate. I constantly had to check and adjust the tracking, it simply would not stay where I set it. Also the C-Major has a wonky anti-skate adjustment which is a pain in the butt to adjust. The piano black surface is also a pain to keep clean. I was not a fan of the feet that came with table, I thought at this price point they could have been better.  Lastly, there is practically no customer service. Yes there is a U.S. distributer but good luck getting them to respond. Pro-Ject does not seem to treat them as family, if you catch my drift. When I had the table I used the Ortofon Quintet Blue which came with the table. I only kept the EAT for a matter of months, I hated it that much. I have since then moved to a different table. But let me comment from the perspective of an elder person that has been "re-introduced" to Analog. I recently changed my cartridge and it made a world of difference. Lets face it, the cartridge is where the rubber meets the road. IMHO, it is the most significant upgrade you can make and represents the greatest bang for the buck. Look, if you want a new TT then buy one but if you like or love the one you have have then be kind to it and get it a new cartridge. 

Bottom Line: I do not like EAT turntables. You can do better.

Based on my experience, you will hear substantial difference. I had switched from Music Hall 5 to Marantz TT15S1 transferring Ortofon 2M Black from one to the other. All other system components the same. The difference was huge in every aspect of performance. I think these two components are somewhat comparable to those in your scenario. Hope it helps.

I went from the Debut Carbon to a C Sharp and it was a great upgrade. I have very nice electronics that help though. My EAT has superb build quality. The C Sharp is great. I'm not sure about other models.