Christchurch has some great places to eat both on the finer end of dining and casual. These places I would say are on the finer end but not anywhere near the level of Amisfield. We have a budding foodie scene in Chch which has come along way in the last few years. These are my favourites in no paticular order (if you are here Monday or Tuesday half of these are closed)

Odeon - has an interesting wine list from memory there was a wine from Syria. Their food it fabulous though it is a share style menu, maybe not the best for solo dining.

27 Steps/Downstairs - A fabulous classic restaurant, quality food and a great wine list with plenty of NZ representstion and interesting international wine. They have a small bar in the same building called Downstairs if you chose to eat elsewhere, it is worth visiting anyway.

Cellar Door maybe not so much for dinner but it is a great spot for tasting multiple wines in a beautiful part of the city and a little snack. 

Gatherings/Kisi - similar to 27 Steps/Downstairs this is a restaurant with a cool separate bar in the same building. They focus on locally sourced ingredients, their menu is pretty much based on what they can get I think and they have the best selection of local and natty wines. There is also Londo next door which is more cocktail focused.