Mono block Sonic difference $5k vs $25k

I'm not able to get out much too better understand differences between very nice and really nice Mono block amplifiers

Understand? How are you are trying to understand? I would suggest try and listen instead. Compare and contrast, ideally with same speakers on the same room. Any dealer should be able to accommodate this. They likely have available both for sale.

Now, if your budget is $5,000, and totally nothing wrong with that, no need to sweat the $25,000 amp. Buy the $5,000 amp that sounds best to you. Forget the $25,000 amp.

I have Moon 400M monoblocks which are approximately $5k each.

I think they sound great.

I’ve heard monoblocks that are $25k and higher (Martin Logan and PBN audio). Different systems and the difference I’ve noted is the dynamic impact and detail.

Does that mean all $25k amps will have more details and dynamics than all $5k monoblocks...certainly there will be exceptions. Is the difference worth the cost, that’s a question for the specific person spending their money.

I have monoblocks that are the only two in the world. Their cost is not important. Unbelievable assault on what is possible. Forget the idea that cost matters. If, and IF is the crucial consideration here, you really care about music reproduction, find a master craftsperson to build the ultimate amplifiers of Your Life. This is what living human life while caring about music reproduction looks like.

What amps has the OP owned? What does he have in present use? What speakers?

A $5K amp vs. a $25K amp? That's the equivalent of a $5K watch vs. a $25K watch - just a greater level of bling! Too bad you can't wear it like a watch on your wrist to impress!