Those Sennheiser are not active noise cancelling which is the defining feature of Bose QC headphones - and why people are paying the money. Closed back headphones do work great for blocking noise, but are usually heavier and less comfortable.
Their build quality and sound is also pretty good. I have a decent music background and also have Sennheiser HD650s which the audiophile crowd loves, but I think their build quality is cheap plastic (they're also open, require an amp, and cost $400).
I think the Bose hate is mostly tribal nonsense - it's cool to signal audiophile virtue by hating a dominant brand that lay people like.
I think most of the Bose hate comes from their speakers which cost quite a bit for the sound quality. Much of that might be historical.
These days though I don't think anyone buys Bose products solely for their sound quality, they buy them for specific use cases like noise cancelling, or filling a room with a very small speaker (those Bose sound docks were pretty incredible when they came out). Bose has done a good job at doing something unique while offering sound quality that is mostly good enough.
I happen to have a pair of those, which I chose over the QC35s, however I would disagree with GP that their ANC is superior in any way - at best it's almost as good as the QC35s.
I bought them because they were more comfortable on me, the ANC was good enough for my occasional use, and I liked the way they look.
But there's half a dozen other Momentum headphones, some with, some without ANC. Sennheiser's naming schemes are aggressively unhelpful. Just look at this small subset of their overall headphone selection (hit Show all): https://en-de.sennheiser.com/music-headphones-portable
Naturally, they don't call it ANC, it's NoiseGard™ [sic].