I find the Sadowsky ME models comparable to Sire, but not the Fender Pro line.
I own a Sadowsky MetroLine M5-24 (Japan), Sadowsky MetroExpress Modern (China), and also a Fender Pro II Precision (USA). For what it's worth, I will share my
subjective experience on those models to help you a bit. Ignoring the obvious timbre/sound differences:
- Sadowsky ML is by far my favorite among this trio. If I had to pick a single one for the rest of my life, it would be that. It's very comfortable, a joy to play, and praised by multiple sound engineers for its balanced sound. Each note on its fretboard sounds equally clear and articulate.
- Compared to that, Sadowsky ME is in the same ballpark but doesn't have the exact same comfort and sound. To my ears, it sounds less clear and less balanced from note to note. Still, it is a very nice bass for its price - it is my backup/stunt modern bass, and I'd take it to any gig without hesitation.
- Fender P stands right in the middle of those two basses. A comfortable bass without any apparent problems, it sounded great in any gig I brought it to. It feels much better and sounds more inspiring than the Sadowsky ME, but not luxury-level as the Sadowsky ML. Mind you that I have flats on that bass.
I played a MetroExpress JJ once at a store, but I put it down because it was susceptible to EMI noise - which is the case with most Jazz basses I played before (even high-end ones). On the exact same rig, the Sadowsky Modern was dead silent. But my perceived quality of ME JJ was definitely less than my Fender P - the Precision feels more premium and inspiring to me.
For some reason, the (roasted) necks of both Sadowsky ME models had an unrefined feel and increased unmusical click-clack; in my experience. The sound is kind of fixable by EQ, but the feel is not my favorite. But very competitive instruments in their price points - I liked the ME series enough to buy one.