I've tried two ways of using SVGs in Collect beta, as a note and a select_one, in both, the SVG displays, but cannot be pinch zoomed or panned like it can in an image-map appearance.
I think that an SVG for a select_one is a pretty unusual use case, but the ability to have a note that shows one that can be zoomed is useful, eg a detailed map/layout.
I attempted to get most of the way to the above by creating a select_one item with image-map appearance and a read_only flag. In Enketo the SVG is shown, albeit strangely - as if it was no longer an SVG, a bit paler & fuzzier, but in Collect the read only flag supresses the SVG from being shown at all.
Removing the read only flag and setting the choice to something that doesn't match an ID in the SVG and making it an optional answer does display a zoomable SVG but won't accept any input.
BTW. in Collect, (including image-map) the SVGs appear to be drawn inside a fixed square box, but Enketo they aren't. So if they're wide and short images there's a lot of whitespace on the app screen.