The difference is potentially meaningful, but how important it is depends on how you shoot.

In general, an extra 2+ stops of dynamic range is most noticeable when you heavily lift shadows or deal with very high-contrast scenes. Cameras with more DR usually keep shadow detail cleaner and retain color better before noise and banding become objectionable. Highlight recovery is also affected, but once channels are clipped, lost color detail cannot be fully restored.

That said, a single side-by-side test shot won’t tell the whole story. Dynamic range changes with ISO, and the results you get also depend on the RAW converter and editing approach. Lab scores can be useful as a rough guide, but they don’t fully predict your experience.

So the practical answer is: if your work often involves deep shadow recovery, exposure mistakes, or high-contrast landscapes/interiors, the A7’s wider dynamic range could be clearly beneficial. If your subjects and workflow rarely push files that hard, the difference may matter much less than other factors.

The best approach is to test both cameras yourself with the kind of scenes you actually shoot, ideally using the same exposure approach and your preferred RAW software.