Comparing the two against each other and the firm’s 45-175mm f/4.0-5.6 PZ (Power Zoom) model, there’s a modest improvement in sharpness at all focal lengths over the 45-150mm and it’s noticeably sharper than the 45-200mm. In spite of this, while it falls rather neatly between the two models in zoom range, retailers are asking for a $100 premium over the 45-200mm. Not only that but the power-zoom feature isn’t for everyone (though it is well suited for video capture). The only other concern is a significant jump in chromatism, though that can be mostly corrected in-camera or with software if need be.
Looking at the two Lumix zooms against the stabilized Canon EF-S 55-250mm f/4-5.6 IS II (90-400mm equivalent) mounted on the equally tiny Canon EOS 100D / Rebel SL1, it’s clear they can’t quite match it in sharpness but it’s very close. In most other respects, the lenses perform similarly.