The Soyuz wasn't the only one, Sisko's Saratoga also had sensors off the sides. But there was also a background ship with a proper sensor pod built by Adam Buckner, labeled as USS Antares (see bottom of page here & here). Didn't get to see it very well, but it was there!I would have liked to have seen a Miranda class with a sensor pod instead of a weapons pod- it seemed to be a good Explorer with the two large Shuttlebays providing support.
The closest we got was the Soyuz variant (assuming all those long poky things were long range sensors).