Just wanted to make sure I wasn't overlooking something (and yes I Googled! ): The Spark does not have the same digital zoom feature as the Mavic.. at least that I can find.
Though Spark does not have digital zoom, you can accomplish the same result in the edit/post process. The result won't be as good as the Mavic since you'll be cropping a 4K video vs a 1080.
Thanks -- really wish they'd put that zoom on all the DJI products. Not really concerned about the quality -- it's just nice sometimes to get closer without getting closer -- in real time.