Well I've been a TransFan since an 80s childhood too, but can still get surprised how big or small some G1 Transformers I did not own (or see) as a child turn out to be.
One thing that still gets me every time I see them is how big the Pretender Beast shells are since I didn't see them in person until the mid-late 00's. Much larger than I ever imagined as a kid. Same with Galvatron. And Sixshot. which made Quickswitch disappointing small when I finally played with him.