When you boost the top end with any digital EQ plugin it feels like it's just adding fizz on top of the signal. It's like there's a clear distinction between the real tone and changed frequency response. When you boost the top end with a good analog EQ, it feels like we sent little microbes to get down deep into the signal and fundamentally reprogram it to BE something else. It doesn't sound like you've used EQ when you've used a good analog EQ. It just sounds “that way”. 
If a person never heard a good analog EQ, they may assume that they would be better off with their usual plugins that offer tons of flexibility in terms of bandwidth, frequencies, etc.
We offer the best Analog EQ's and would recommend them as soon as possible when upgrading your studio.