I tried on a pair of the newly launched Martha's but wasn't totally impressed with the fit. Found the denim a bit "slack" and they just didn't sit right.
I have now bought Miss Selfridge Super Skinny Jeans as an alternative. They are fab as they are really NOT super-skinny because I cannot begin to get my athletic legs into a pair of truly skinny jeans! IMO they are the same fit as Marthas - perhaps closer fit at the ankle. They also have a decent mid-rise on them so no muffin top or arse cleavage issues.
This is the link to the "ginger" version which I have (gorgeous colour) but they have a wider range of colours than this.