I definitely hear a big difference between a D1T and a D1 or a D1AT and D1A. That is the same for the D2H iterations in both series. Certainly they all sound like Collings, but they are different. I also hear differences between the various versions of J45s (Standard, TV, V, Historic) and Martin D18s (Standard, V, GE, A, and MD).
If you're one who thinks they are more similar than different, or not different at all, then save yourself $1k or several $k and always buy the Standard Series.
Not to mention, beyond acoustic differences, there are ergonomic differences as well including neck profile and string spacing.
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‘00 Martin HD28LSV
‘04 Martin D18GE
‘22 Burkett JB45
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