Oly XA would be a nice choice (it is a great cam and I have one of my own but let's be clear that the lens is not razor sharp by any means). So I'd urge you to also consider (now these are sharp):
- Ricoh GR1 series
- Fuji Klasse S (that 38mm lens is truly superb and as a current model so no service and parts issues)
- Konica Hexar AF (35mm f2. Would be perfect albeit it a little larger....it is the film version of the Fuji X100). I will have one of my own soon. I MUST!!
Otherwise anything from Steve Gandy's (CameraQuest) Compacts Guide....There's some beauties on there. Just got the Konica Auto S3 myself. It's 38mm f1.8 - 6‐Element, 4‐Group lens was tested by Modern Photography and at ALL apertures demonstrated center values between 64 to 82 lines per mm resolution. This is Leica‐class performance, and so was written up as “one of the best semi‐wide angle optics of its speed we have ever tested".
Oh she is a beauty to behold - in her stealthy black - but I will know more about her capabilities once the seals arrive from Jon Goodman in the US.
Best of luck mate....there's a few out there though.