Index to pinkie: Orly Cashmere Cardigan, China Glaze Spontaneous, OPI Do You Lilac It?, OPI A Grape Fit
Orly Cashmere Cardigan: This one is quite a bit bluer when compared to these other shades. When worn alone I definitely consider it purple.
China Glaze Spontaneous: I'm surprised by how similar this and A Grape Fit are, but this is just a bit darker, otherwise the tone is the same.
OPI Do You Lilac It?: This has some gorgeous pink tones in it and it is basically Spontaneous/A Grape Fit but a few shades lighter.
OPI A Grape Fit: As I said above this is incredibly similar to Spontaneous, just a touch lighter. It applies just as beautifully as the China Glaze as well.
Index and middle are Spontaneous, ring and pinkie are A Grape Fit
top: Spontaneous / bottom: A Grape Fit
They really look the same... And about your bottle of A Grape Fit - my bottle of Can You Dig It looks the same: with a blue liquid on top. Weird OPI. =)