It's a centerpiece model 2 cavalry units, and 1 infantry unit + the collectors tome stuff.
Start collecting boxes are generally build around 1 centerpiece model, 1 infantry unit and 1 cavalry/monstrous unit, and often a bonus foothero, especially if the centerpiece isn't a hero already. Occasionally something will be swapped out for a different option.
The only start collecting box I can quickly find that's genuinely less would be ironjawz, who for some reason don't have a centerpiece model, and no replacement for it either.
So compared to most startboxes it's 1 unit more. Which I wouldn't call "considerably more".