whipsilk
Ah, I'd have to agree with Tarotwolf with his qualification, "when comparing tarot decks". Given that qualification, there probably is a pretty clear distinction, but - whether Visconti or RWS - the Majors are still recognizable; you could probably correctly assign the name to the image in the Visconti without seeing the titles in most if not all cases. Try it when you get the deck - take out all the Majors, mix them up well, and see how many you can assign the name to (in the Visconti decks the Majors are unnumbered and untitled). The courts might be a bit more difficult, of course; depends on how well you know them.It seems to me these two decks are about as different as you can get when comparing tarot decks.
As to your question, Tinevisce, it's not so much that "visual depth is missing" as it's a completely different paradigm - RWS uses a visual, imagistic approach for the minors while the Visconti (and other decks with non-scenic pips such as all the Marseille variants) uses a numeric approach (e.g. showing ten swords, three cups, etc.) with some decorative elements. There's also a third school (again as Tarotwolf mentioned) which I think of as the semi-illustrated pips approach, in which the number of suit items are the focus, but which include other esoteric symbols and some imagery that never quite reaches the full 'mid-story' approach Pixie Smith gave us in the RWS (the Thoth and some other Golden Dawn decks are the best examples of this - take a look at the Thoth pips in the Aeclectic Thoth page in Cards).
Anyway, I really do hope you enjoy your Visconti-Sforza, Tinevisce. Let us know what you think when you get them.