Is this purely because they are LHCS, or is it because you hold them in the same high regard as the travelling environment of the Mk3s? Personally I don't find that, having travlled on them with CS. It makes me wonder what the way forward is for the bench mark in quality, rather than simply using the benchmark on the type of train. For starters, the Mk5 production line isn't nearly as big as that of the Mk3s, and a key difference is that they were simply adapted from the Sleeper design, so it's not as if they are or were intended to be a fully fledged IC LHCS from the get go like the Mk3s - which were bespokely designed for the purpose rather than the adaptation we are seeing from TPE's order (if that makes sense?).
Edit: Misread what you had written and were merely making the assumption that Mk5s are the most we'll see in terms of LHCS going forward - which I agree with.
Though for clarity in general, I created the thread to gain an insight as to how Mk3s compare with the standards required for new rolling stock, and whether or not these standards can be achieved in todays climate (which they haven't with any rolling stock since).
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