I can confirm this also, had the BL8000’s (mk1) for years and liked the sound a lot, full and mature but just a bit to less bass.
When I used them with the V1 tv, due to the sound engine of the tv, they were at their best and gave much more bass, but sounded bit over pushed at their limits.
Switched to BL14’s but due to their design (only sub for bass, midrange and treble by satellite speakers) I never got the full sound the 8000’s gave me. I had to tweak the sub all the time for more or less bass.
Few months ago switched to BL18’s and very impressed. Way more clear than the 8000’s and the bass power is so rich! I’ve put them in free position despite they are close to wall and the bass is so full, it’s almost if a sub is still in place. What I like is that they sound so natural balanced and yet powerful with many different music styles.
To my ears they are way above BL8000’s.
I’ve BL3’s in same room and as they are more close to the BL8000’s, I can compare different style of the speakers. I find the BL18’s very impressive.
I have to state that the sound processing of a Beovision (now a Horizon) does improve the performance of the connected speakers
Of course I lack the experience of the BL20, BL50 or even 5’s or 90’s, so I still might be a dummy in the B&O upper class. But to my humble experience the BL18’s overclass both design- and sound-wise.