Transformer stepup size

Thanks for the responses. But my question remains unanswered as to the technical merits of a much (4 to 5 times) larger design in terms of overall performance. My ears seem to detect a fuller, deeper in bass extension with the larger design. Moreover, the cost seems proportional to the size of the stepup as well. Any actual comparative experiences with magnetic stepups?

Gents: there has been a deviation from topic here I notice.
Nevertheless, for info, let me tell you that I have owned many phono stages without stepup : Atmasphere MP-1, the Groove, Walker Reference and the Aethetix IO. I have also owned a few that use a SS stepup (Audible Illusions, Herron) and some that use a transformer stepup(Hovland and now the amazing K&K). So I have been around the block a few times. I currently favour the much more expensive but stunning Bent Mu stepup(with integrated short interconnects) over the Lundhal inside the K&K. So I was probing for actual comparative experiences with stepups to calibrate my own, rather than debate the usefulness of stepups. Debates of the comparative value of phono stage design with/without stepups for MC application have been covered elsewhere, I believe.
Perhaps I selected the wrong forum.

yes, Raul, this corresponds with my experience so far. More lower frequency energy with the larger core designs gives more body to instruments. More satisfying overall.