The common (perhaps unfortunate) misconception is that world-class midrange performance is the exclusive jurisdiction of these BBC inspired brands and their trademark polypropylene cones. The reality is there are many brands that match and even exceed the midrange performance. Good examples are some of the Joseph Audio and Tyler Acoustic models that employ magnesium Seas Excel drivers.
As much as I enjoy and respect these old guard brands (Harbeth/Spendor/Graham et al), they simply do not keep up with speakers equipped with top-shelf parts and drivers IME.
Thanks for sharing your experience. Will keep your observations in mind.