jpg quality question with imagemagick and Gimp

If I convert an image to jpg with a given quality of 85% I get this result:

convert -quality 85 in.jpg out.jpg

in.jpg: 174296 bytes
out.jpg: 150262

If I do it with Gimp, 85% quality, the resulting size is much smaller.

out.jpg 38650

The output quality of Gimp in this case is ok for me. I am looking for
size (bytes) reduction.

How can I get the same result with imagemagick (convert, mogrify)?

blau