Here's a comparison table between the dimensions of the four form factors Tesla is offering:
Code:
car length width height
Model 3: 4,694 mm (100%) 1,849 mm (100%) 1,443 mm (100%)
Model S: 4,980 mm ( +6%) 1,964 mm ( +6%) 1,440 mm ( +0%)
Model Y: ~4,830 mm ( +3%) 1,849 mm ( +0%) ~1,643 mm (+14%)
Model X: 5,036 mm ( +7%) 1,999 mm ( +8%) 1,684 mm (+16%)
Note how close the dimensions of a 'base Model X' are to the Model Y: only ~4% longer, ~8% wider and ~2% taller.
The most important metric for SUVs is generally their height: easier to get into and move around in - and in height there's only a 2% difference.
I.e. the size difference, with the exception of it being 8% narrower, would be difficult to notice in person. The Model Y
IS pretty close to the base Model X without Falcon Wing Doors and other luxury features.