For wide-angle I've used the Panasonic and the Century .6 and Century .7. The .7 is huge, and while it's zoom-thru, it's expensive and not necessarily the sharpest edge-to-edge. The .6 is half the price, wider, lighter, smaller, but only allows partial zoom-thru (up to about Z60).
The Panasonic is fully zoom-thru, but it's the weakest of the wide-angles, being a .8.
The Century lenses will complicate your quest for a mattebox, most matteboxes won't work with the massive diameters of the Century lenses.
For matteboxes, I bought a CAVision and used it once before I sold it. Not necessarily a "bad" product, but it's no Chrosziel. The Chrosziel is 3x the cost of the CAVision, and the Vocas/Century is about double the cost of the CAVision. I'm still shopping...
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