Why is color an sharpness changing when sending image from LR to PS using the "Edit in..." action??

Hi,
I hope someone can help me, as I am getting a bit frustrated. I've been doing edits on a photo in LR and I want to take it to PS to du a bit of extra tweaking. However, when opening the photo in PS using the "Edit in..." action in LR, the image looks completely different in terms of colour and sharpness. Look at the attached image. I am editing a .ARW file and I am using ProPhoto as colour space in both applications. 

Anyone else who has encountered this and might have an answer to what is going on?