O, I can't say that. But to me, when someone says he has a hard time drinking coffee without sweetener,he lacks flavor in his coffee.

I use single origin Tanzanian Arabica beans for my espresso. But so much depends on variables besides the coffee alone.

The coffee I drink is about 25 euro/kg and that price would be the minimum for decent coffee where I live. I tend to look for balanced acidity/sweetness.

Tend to gravitate towards Arabica beans from either Kenia/Tanzanian/Burundi (good acidity) or middle america (balanced sweet/acid)