Ment
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Vegetables – I think this knife isn't for cutting vegetables, but for peeling them. Otherwise, you can't cut any vegetable on a board completely with a curved knife.
Cheese – here, you can only chip off Parmesan from a whole piece; otherwise, see the previous point.
Pizza – maybe it's possible, but a proper pizza knife looks like this:
http://www.klenmarket.ru/upload/shop_1/8/3/9/item_8398/shop_items_catalog_image8398.jpg
Heretics and xenos – the combat effectiveness of chainsaws, especially against the heavy armor of Chaos servants, is greatly exaggerated. If an Imperial Guard is smart, he'll take a hammer, a blaster, or something heavier.
Cheese – here, you can only chip off Parmesan from a whole piece; otherwise, see the previous point.
Pizza – maybe it's possible, but a proper pizza knife looks like this:
http://www.klenmarket.ru/upload/shop_1/8/3/9/item_8398/shop_items_catalog_image8398.jpg
Heretics and xenos – the combat effectiveness of chainsaws, especially against the heavy armor of Chaos servants, is greatly exaggerated. If an Imperial Guard is smart, he'll take a hammer, a blaster, or something heavier.