There has a been a online feeling going around for a few years now that the tweeter used in both the 30s and 40s is superior to the one used in the SLH5 - nothing confirmed, just a feeling.
It would be interesting if you could post your impressions of the 40.2s, as I’ve only heard the SLH5s sadly).
The 40s have long been regarded as amongst the big hitters of the audio world, going back around 20 years since
Robert E. Greene posted his iconic review.
He used to own a pair back then but I’m not too sure what R.E.G. thinks of them today.