While I usually prefer Manual modes, I have no qualms about setting the X-E1 to Auto mode, including the ISO (up to 6400, though quality remains impressive at even higher ISOs).
In addition, as the slim form factor fits in an 8.5mm x 8.5mm auto focus camera module with a height dimension of 6.0mm, the S5K3H2 gives design engineers a great deal of freedom in designing camera modules suitable for slim mobile handsets and small form factor applications.