I haven't found a solution (not sure whether it's possible to get comments sorted by email/status), but I did found a work-around: get all the comments, then filter out the comments you don't want, and then order the List of comments. Here is the code: 

var query = new EntryCommentQuery();
var col = QueryHandler.Instance.GetQueryResult<EntryComment, EntryCommentCollection>(query)
                .Select(c => new CommunityComment(c));

// filter for the current site's languages
var comments = col.Where(
	c => (languageBranch == null || languageBranch == c.LanguageBranch) &&
		 (startDate == null || c.Created > startDate) &&
		 (
			(getApproved && c.Status == CommunityCommentStatus.Approved) ||
			(getAbuse && c.Status == CommunityCommentStatus.AbuseReported) ||
			(getWaiting && c.Status == CommunityCommentStatus.WaitingApproval) ||
			(getSpamSuspected && c.Status == CommunityCommentStatus.SpamSuspected) ||
			(getMatchPhrases && new CommentPhrasesMatcher(c.Content).Match(false))
		 )
	);
	
int sortDirection = (int)(ViewState["SortDirection"] ?? 1);
string sortField = (string)ViewState["SortField"] ?? "Created";
switch (sortField)
{
	case "Status":
		comments = comments.OrderBy(c => sortDirection * (int)c.Status).ToList();
		break;
	case "Email":
		comments = comments.OrderBy(c => c.Author, new AuthorEmailComparer(sortDirection)).ToList();
		break;
	case "Created":
	default:
		comments = comments.OrderBy(c => sortDirection * -c.Created.Ticks).ToList();
		break;
}