I'm amazed that anyone would look at Bond's respective reactions in the two films and come to the conclusion that he cared more about Solange's death than Fields'. If anything, I'd give the edge to Fields, not Solange.
Perhaps I'm nitpicking at your post, but Fields wins by well more than an 'edge', byline. It's a clear victory for Fields.
CR teaches us that Bond sees Solange as an unfortunate, but necessary casualty. QOS teaches Bond, a Bond that has now experienced true love, that there is a big difference between seducing a girl to her death for information and seducing a girl to her death simply because he can.
Whether or not you (not YOU personally) think those lessons are well spoken by their respective films is neither here nor there. The
intentions in each film are clear.
At Solange’s death we have:
M (paraphrased): “This doesn’t really bother you, does it?”
Bond, with an emotionless expression: “No”.
You can’t get any clearer than that. You just CAN’T. It could be argued that Bond, in fact, really does care, and is simply suppressing his emotions for the sake of keeping a clear mind set on duty. I tend to agree, in fact. But that’s our own personal speculation. Even when pressed on the subject of whether killing Obano bothers him, Bond responds to Vesper “I wouldn’t be very good at my job if it did”, circumventing a direct answer, leaving it again to our speculation. But what’s up there on screen at the scene of Solange’s dead body, is pure ice.
The scene at Fields’ dead body, however, has another vibe entirely. Bond is visibly angered/troubled by the injustice that lies before him and, almost desperately, tries to find some sense in it before M cuts him off.